[JK2SP] JK2 writes USERINFO cvars to saves, we write both in jk2 mode for now.
[JK2SP] Assign correct hudfiles in ui module for jk2mode.
[JK2SP] Merging in some fixes and cleanup from JASP cgame/game code.
[JK2SP] Hopefully fixing timer save/load code by using a modified version of JA's code, but keep compat with JO.
This commit should remove the requirement for std c++11 requirement in master branch.
Refs #498.