* Fix null pointer dereference crash in server hitbox drawing code; implemented a proper getter for CStudioHdr.
* Moved 'baseentity.h/cpp' to 'game/server/' instead.
* Overall light cleanup.
* Added some getters in 'CBaseEntity' and 'CServerNetworkProperty'.
* Implemented 'CPlayer::SetTimeBase'.
* WIP implementation of 'CPlayer::RunNullCommand'.