Added internal docs.
Clarified sticky keys docs.
Moved client build docs to Doxygen.
Ignore CRTCs with no outputs.
Win32 fixes.
Removed deprecated Doxygen option.
Fixed VC++ warnings.
Updated bug tag.
Sorted Doxygen pages.
Fixed MinGW warning.
Merge remote-tracking branch 'remotes/upstream/master'
Merge branch 'master' into platform-rpi