Adjusted MD5 blender exporter file - Project RDX mod for Quake III Arena

As said in the shorter description, this is a MD5 exporter I found in the net, with a small addition I made.
The original script was made by a guy nicknamed "der_ton", from the doom 3 community.
Notes to properly export:
- Always make sure no vertex has a weight sum different than 1 (e.g. 0.8 + 0.6, or 0.4 + 0.3 + 0.1). Blender has a way to deal with these events just fine, so you will have trouble realizing it, but the exporter does not. Which means, be careful, or you'll have deformed vertices.
- Assign the "Smooth" flag to all faces. Otherwise the script, for some reason, will split all the individual triangles, and as you can guess that is not good.
- If you wish to export an animation with a "passive" bone as explained above (e.g. in upper body animations, the legs should be passive), delete the bone's line from the action editor. Use multiple actions if necessary.
- You shouldn't use more than 8 weights for each vertex or the model won't work - that's the game's limit. For caution, make that 4 (XReal's limit)