Montague's Mount: Unity FOV correct shadow fix

Easiest one yet - didn't have to change anything from the generic
version and the shader with the FOV seems to work here.

This has also resolved some rendering issues in the distance, so I guess
they were lighting related.
Montague's Mount: Add convergence presets on [,] keys

Not really necessary, but I'm finding these presets convenient since the
driver won't save the convergence unless I create a profile for the game
manually.
Unity / Montague's Mount: Fix DIRECTIONAL lighting shader

This one caused a few surfaces (e.g. dice near story notes, some doors
and a few other random surfaces - nothing else near these) to render
with incorrect lighting in Montague's mount.
Unity: Pre-emptively fix other DIRECTIONAL lighting shaders
Montague's Mount: autofix another surface shader (stairs near end of game)