Completable TR2 and GM levels

[vvs-]

I'll record the engine progress here. It reflects an average state, not necessarily the bleeding edge.

The levels which I was able to complete (sans enemies):

• the Great Wall ( ~~#344~~ )
• Venice ( path without boat )
• Bartoli's Hideout ( ~~#419~~, detonator isn't implemented )
• Offshore Rig
• Diving Area ( ~~#419~~, can't exit the level because monk isn't implemented )
• 40 Fathoms ( ~~#419~~ )
• Living Quarters ( room visibility bug )
• The Deck
• Tibetan Foothills ( path without snowmobile )
• Catacombs of the Talion

The levels which I tried but they can't be completed because of a bugs or unimplemented features:

• Opera House ( drawbridge function is not set, elevator isn't implemented )
• Wreck of the Maria Doria ( #344, ~~#419~~ )
• Barkhang Monastery ( ~~#424~~, room visibility bug )
• Ice Palace ( bounce pad isn't implemented, Tibetan bell isn't implemented )
• Temple of Xian ( bounce pad isn't implemented )
• Floating Islands ( pushable block not dropped, jumping distance bugs, can't grab ladder after roll in midair )

Not implemented yet:

• Vehicles
• Several other objects (detonator, bounce pad, tibetan bell, elevator)