Set up materials to read a configuration file

[StLoch]

This is similar to Ogre, where people can define key/value pairs that will be parsed up into a real Material. Example:

ambient = 0.1 0.3 0.1 1
diffuse = 0.2 0.8 0.2 1
texture0 = "grass.png"

[StLoch]

One thing to consider: It may be nice to be able to specify ranges in materials, to let us basically say "This material should ALWAYS be mipmapped and use linear filtering, but this material can enable/disable mipmaps and change filtering based on user defined graphical settings (low, medium, high, etc...)"

[datalurkur]

This is basically done, unless we want to add mipmap ranges.

[StLoch]

Meh, this is good enough for now.