Color: Moved SColor* structs into SColor.h, so they can be used without
indirectly including CVector[34]D.
Terrain: Added 'base colour', for the Actor Viewer to be able to
modulate the colour of normally-white terrain.
Removed some "using namespace std" (because it doesn't make the code
easier to read, and it defeats the point of namespaces, and the rest of
the code doesn't do it).
This was SVN commit r4392.
Also split Entity.cpp further, moving the rendering code to
EntityRendering.cpp and the JS interface code to
EntityScriptInterface.cpp. This makes each individual file smaller
(about 1000 lines still!) and lets them be compiled independently.
This was SVN commit r4314.
