Diffrent colors depending on block metadata

I updated the renderer to take metadata into account when chosing the color.
Those can be specified by adding a colon and the metadata behind the block id in block-colors.txt. I only added the different wool colors yet.

I tried to adopt your coding style, but I kinda messed up with the line endings... They are now all converted to LF in the repository and converted to OS-default when checked out.
I hope that's not a big deal...

Regards,
Klaus