.tcfg -> .cfg, Kermins re-added, bugfixes

- migrated back to .cfg config files to avoid conflicts with ATM
- using KSP built-in funtions for reading config rather that loading config
  files each time
- config can be read from any directory in GameData/
- DLL & PluginData/ moved to Plugins/ dir
- re-added female-specific heads/suits functionality
- fixed replacing thruster jets and jetpack flags with jetpack texture
- fixed crash when a suit texture is not inside a subdir
- fixed crash when one only provides suits but no heads