Awesomeness added ;)

- Added animated textures for Drives and Directories (texture animation
done in PreRenderBox()).
- Added ttransparency for drives, directories and files (if not
containing thumbnails)
- Changed dirColour for more greeny one (exactly the same as for labels)
- Now each fileNode type has it's own texture list (fileNodeTextures,
dirNodeTextures, driveNodeTextures); Note: fileNodeTextures are not used
in fact
- Bottom face generated firstly for each node type - to eliminate most
of the constraints of OpenGl transparency (NOTE: still some atrefacts
are present). If we didn't do this, the front face wouldn't be
transparent.
- Added resources files for drives and dirs textures (png files)