This patch adds a support for Ogre XML meshes, which define per-vertex diffuse colors. The code populates aiMesh structure during import with aiColor4D elements.
I have tested the code in Ogre XML -> Collada transformation process and it seems to replicate the data correctly to Collada.
Only diffuse color channel is supported, other possible color channels in the Ogre XML are ignored.
The patch has been written against latest trunk, as of today.