Make include-what-you-use happy with some files in source/tools/atlas
and fix what needs to be fixed.
Update premake script to include missing deps and drop various extra
paths for simplification.
Don't always include wx/wx.h via precompiled.h in case PCH is disabled.
Ref: #8086
Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>