TSAGE: Remove 2 useless variables from scene 180, rename a variable. This breaks the savegames
TSAGE: R2R - Remove useless variable. That breaks savegames compatibility
TSAGE: Remove some useless variables in Blue Force, fix compilation broken in last commit
TSAGE: Remove more useless global variables. Savegames compatibility preserved.
TSAGE: Increase savegame version in order to properly skip the useless variables
TSAGE: BF - Remove a couple of useless variables. Savegame compatibility preserved.