Patch 1.20

- Some level streaming optimizations.
- Closed church balcony doors on Nest level.
- Fixed a bug where storage door that was locked from inside on Source level cave could be opened from the outside.
- Made church side doors unbreakable on Nest level so player can't shoot his way in.
- Made one door unbreakable on Source level that was not meant to be accessed even by breaking it.
- Added texture to flashlight cone and improved functionality regarding brightness.
- Disabled saving during movement inside rail office on Source level.