Update 1.5.2

Basically these are just graphical changes for the hot giant and the scorched world, but it took me a while. I hope you appreciate the result.
Due to some quirks of the code, hot giant is now a full-fledged planet class. You will also now see a mention that only barren worlds can be cracked. (There have been many questions about this.)

Update 1.5

- New types of planets are no longer classes of planets, but will be
subclasses as in New Frontiers.
- Added a new subclass for the Gas Giant - Hot Gas Giant with a unique
appearance and portrait.
- Minerals are now used instead of alloys to construct planetary
stations, districts and buildings.
- All standard buildings can be built at planetary stations.
- Now planetary stations will immediately receive the necessary mining
areas if the planet has the corresponding resource. There is no longer any need
to assign a station type.
- Most station types have been removed, now the corresponding areas
depend on the resources available on the planet. There are only a few special
types of stations that you can assign in planetary decisions.
- AI empires will be much less likely to build planetary stations.
- Added more options in the settings for building planetary stations in
the Real Space menu. You can now limit the construction of stations for AI. The
construction of stations will become less common. After 20 stations, the AI
will stop building stations completely. Or you can completely ban the
construction of AI stations.
- Added new planetary features that depend on planetary modifiers.
- Added a special type of planetary feature that opens up special areas
for hunting giant alien creatures.
- Many small graphical changes and other fixes.