Transparency AA added

Added transparency AA to grass and distant statics via alpha-to-coverage.
Grass and statics have different coverage profiles; to avoid
over-transparency and mip fading the coverage is calculated differently
for each pass.

MGEgui's macro editor now allows toggling of transparency AA.
Morrowind UI scaling added

Morrowind's UI can now be scaled through a function call to the GUI internals.
It sets up the GUI as if the resolution was smaller by a scale factor.
Tidy whitespace and expunge tabs
Morrowind UI scaling fix

Fixes the inventory window's broken mouse interaction with world objects,
by patching the UI raycast code to use the scaled UI size.
Minor rendering tweaks

Dynamic shadow colour is bluer by a small amount.

The grass shader early clipping is a little more aggressive.