Improved version checks for demo file lists

• No longer relies on the demoversion global variable (which was incorrect for a couple instances, like ghosts), now we pass the version to the file list functions.
• Don't set any demo global variables when checking a demo for valid files before playback.
• Exit said file check function asap if its a title demo instead of doing it after we've already opened the file.

changed milestone to %2.2.12

added Bug label

added 1 commit

• 6780f895 - Add missing param to G_CheckDemoExtraFiles in G_CheckDemoForError

Compare with previous version

merged

mentioned in commit e2c6a336

mentioned in issue #1070 (closed)