Save/Continue with Episode Modules

[tehtmi]

Continuing from an episode module tries to load the player's inventory before the new content from the module which can cause new ids to be unrecognized.

Other issues may occur with the lua state being different when continuing a module versus starting a new game in a module (e.g. DIFFICULTY and player may not be defined?). Either the use of some of these variables should be clearly deprecated (and unnecessary), or their availability should be consistent.