Fix for the Shattered Ring origin.

Tweaked marginal world spawning, but further tweaking will be required;
Added new Sol initializer alternative;
Fixed Hot Terrestrial default atmosphere and biosphere as Low Water-vapour and Sparse;
other minor tweaks and fixes.

Increased Machine Empire's base habitability on primary and secondary climates. Check the edited machine trait for information about further habitability bonuses;
Fixed wrong textures when terraforming Earth or Mars.

Added 5 new marginal world classes;

Fixed issues with terraforming a sub-terranean tomb class back to a standard surface tomb;
Removed district build time penalty on subterranean colonies, replaced it with a housing penalty;
Barren terraformed worlds now get a minimum habitability of 40% so they can be colonized;
Adapted and Aquatic terraformed worlds also get a minimum habitability of 60%;
All marginals with the yellow modifier circle, plus the barren and karstikos classes (red), can be terraformed to subterranean versions to get the +25% habitability bonus. This may be tweaked or reverted in the future;

IMPORTANT:

Lithoids do not get habitability bonuses or penalties from a planet's Biosphere, and the vanilla fixed habitability bonus has been halved. To compensate they now get a bonus depending on the number of available mining districts. Check the edited Lithoid trait info. Different atmospheres will still reduce habitability.

Machine empires do not get habitability bonuses or penalties from either the Biosphere or the Atmosphere, and the vanilla minimum habitability has been removed so they do not get to colonize every marginal world they find. To compensate, they now get a bonus depending on the number of generator districts built (not available like lithoids, but the built instead). Check the edited Machine trait info.

Minor bugfix.

The terraformed classes now have a modifier which gives them a minimum habitability, 40% for the Barren class, 60% for the Adapted and Aquatics. This enables you for instances to colonize Mars after you convert it into a Barren by doing the Decision (on Earth, after researching Atmospheric Manipulation);

Marginal worlds now spawn as habitable planets with a very low habitability, they are variants of the Tomb world so this change also affects nuked planets;
Habitable worlds can only be colonized if they have a minimum of 40% habitability, which should make colonizing marginals in the early game impossible in most cases;
Removed the Underground Infrastructure mega project on marginal worlds which used to turn them into habitable planets;
The Outpost mega project on marginal worlds can still be built, which spawns orbital deposits for mining/research stations, but this will convert the worlds to uninhabitable and for now this cannot be undone;
Survey ships inform you when they encounter a marginal world, the first time this happens you will get a new tech option, Atmospheric Manipulation, and a tech progress bonus each time a marginal world of a different class is found;
The Atmospheric Manipulation tech allows, on the main mod, for uninhabitable worlds with the Terraforming Candidate modifiers to be converted into Marginals via a new Decision on a colonized world in the same system, so having an existing colony is a requirement, otherwise they can still be terraformed later with Climate Restoration;

Added System Colony mechanic:
- Colonized worlds or habitats with an uncolonized world in the same system get a Decision to establish a system colony;
- Once this is done, it gets multiple options for different types of colonies, with different district availability requirements on the uncolonized world;
- Multiple system colonies can be built as long as the uncolonized world has the required available districts;
- Building a system colony adds a special deposit on the main colony which provides housing and jobs;
- Building a system colony adds a special blocker on the uncolonized world which reduces the number of available districts;
- The uncolonized world used to establish the system colony, can still be colonized, but it will have some districts used up, unless they are removed by a Decision on the main colony;
- If the secondary world is colonized, no new system colonies can be built on it;

Marginal worlds have higher chances to spawn in random systems with an existing standard habitable world, but they may also spawn without one, and remain useful if you choose to build a habitat in that system, or just colonize the marginal once you're able to;
With just the base mod, marginal worlds can be terraformed with climate restoration like the tomb world, but the extended sub=mod overwrites the terraforming files so it disables marginal terraforming except for the tomb and barren class;

The Atmosphere modifiers now add a habitability ceiling depending on the species preference, some species may find one atmosphere type reduces maximum habitability to 90%, others to 80 or less. The most hostile atmospheres have the lowest ceiling and affect every species the same way. Atmospheres can be upgraded in the extended sub-mod;

The Survivor trait has been modified to give 25% habitability bonus on marginal worlds (tomb included), so the post-apocalyptic species are likely the ones capable of colonizing marginal worlds early;
Further tweaking done regarding habitability for machine species and others;

Custom star system initializer for CoM added, which disables UNE and turns Earth into a Tomb world, good if you want to play as CoM (custom one maybe) and want to later restore/terraform Earth and Mars;

Made some changes to the different planet classes modifiers;
Added resource bonuses/penalties to the biosphere modifiers again.

Fixed bug with Arc furnace megastructure;

Added habitability cap effect for atmospheres different than the species' homeworld, which can lower the planet's maximum habitability from 90% down to 30% depending on how toxic the atmosphere is. This is meant to prevent even hostile marginal worlds from reaching high habitability with tech and other bonuses, but can still be avoided if you upgrade the Atmosphere (which requires the Extended sub-mod). Note that in worlds with multiple species, some may like the current atmosphere, others may not and may get different effects.

Fixed bug with Sulfuric class marginal world's portrait.