Scene actor info

Documentation link is dead

Some more material stuff, renaming of constants, skeletal rendering
experimentation (still broken, although less so; try messing around with
the vertex shader to see if that fixes anything?), now shows textures
w/o shaders enabled (tho they obviously won't scale correctly, so it's
still useless w/o shaders).

Likely my final substantial commit to this project, as per my, by this
point often-repeated and hopefully known, opinions and feelings
regarding OoT/MM/3D hacking.

Prevent crash with mesh headers in ZSIs that have a mesh count of zero,
i.e. no model (ex. MM3D spot00_0_info.zsi)

Cleaned up ZSI support somewhat, added maybe slightly hacky support for
alternate headers/setups; also fixed possible null references during
ModelHandler disposal

Fixed MM3D ZSI identification; fixes #2

Some ZSI file support, basic "mesh header" and room actor parsing

Material stuff, skeletal stuff; nothing really regarding improvements,
aside from some blending/alpha assumptions

More MatsChunk stuff, now actually reading the MM3D-only data; some
comments added to ModelHandler

Much faster, no apparent problems?

Fixed export of materials w/o texture images, now uses a default effect;
fixes #1

Cleaned up Material class properties, added assumed 3rd texture stage
infos; better handling of multiple texture stages in rendering

Changed remaining constants naming scheme, now more OpenTK-like; added
some assumed, experimental and atm unused bone weight stuff

Damn you tabs

Some more assumed material-to-OpenGL mapping; fixed texture wrap modes
(mirroring!)

Some material stuff, OpenGL constants, blah... also a minor Collada
exporter thing

Got OpenTK to NOT swallow up exceptions w/ its red X anymore; also more
skeletal animation experimentation & fixes...

Skl chunk bone reading improved; added option to menu to toggle
experimental skeletal rendering & skinning

Now supports non-ushort vertex indices; fixes (some? all?) MM3D scene
exports