Implemented SetIndexedColors hook, although not really correct.
I don't know why the driver's 8 bit mode were disabled. They seem to
work fine. I had to enable at least 640x480x8 to be able to test
WindowScreen. There are some TODOs in the code. I'll look into them
later.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21410 a95241bf-73f2-0310-859d-f6bbb57e9c96