Removed the unused lib folder.

Some css fixups and missing files as well.
Reorganizing src again and fixing up the build script.
Tricking git...don't mind me.

Last time I tried to rename a folder from App to app (or vice versa) it
totally screwed up git. So, I am temporarily completely renaming the
folder. Then I shall perform the casing change.
Fixing up the raw HTML platform to resemble @dslatten's recommendation.
Removed some unnecessary files.
Fixing up the .NET Optimizer build.
Removing some mysteriously appearing files.