add player checks to slashco_run_curconfig

The Mapping Update

- Added an entirely new mapping system that relies on an FGD file and Hammer rather than just a config file. New Hammer entities to use, plenty of events for maps to be able to react to game progress, and the ability to customize generator/gas can spawn amounts per-map.

- Survivors have entirely new models.

- Lots of balancing tweaks to many slashers and some items.

yeah

Fixes and tweaks.