Fixed: No sprites were loaded for Build maps
Move SpriteFrames.Clear() from R_InitSprites to FTextureManager::Init

- Fixed: Blood sprite rotations were overwritten by the Doom sprite
  rotations.
Don't reopen the reader for encrypted maps

- Fixed: Memory leak when loading Blood maps.
Never cache nodes for Build maps
Fix typo in comment
Fixed: None of the Blood ambient sounds were registered correctly
Correctly assign the sample rate for all Blood SFX formats

- Blood can do 44100 Hz sounds!