Using the central definition adds consistency and cleans up many ad hoc
declarations. The type sal_GlyphId will become a class in the future so
that its bitfield operations etc. can then be isolated into nice methods.

(cherry picked from commit c0a84ad1)

Conflicts:
	vcl/aqua/source/gdi/salatslayout.cxx
	vcl/aqua/source/gdi/salgdi.cxx
	vcl/generic/glyphs/gcach_ftyp.cxx
	vcl/generic/print/genpspgraphics.cxx
	vcl/generic/print/glyphset.cxx
	vcl/generic/print/glyphset.hxx
	vcl/headless/svptext.cxx
	vcl/inc/generic/genpspgraphics.h
	vcl/inc/generic/glyphcache.hxx
	vcl/inc/os2/salgdi.h
	vcl/inc/quartz/salgdi.h
	vcl/inc/salgdi.hxx
	vcl/inc/sallayout.hxx
	vcl/inc/unx/salgdi.h
	vcl/inc/vcl/fontmanager.hxx
	vcl/inc/win/salgdi.h
	vcl/os2/source/gdi/os2layout.cxx
	vcl/os2/source/gdi/salgdi3.cxx
	vcl/source/gdi/pdfwriter_impl.cxx
	vcl/source/gdi/sallayout.cxx
	vcl/source/glyphs/gcach_ftyp.hxx
	vcl/source/glyphs/gcach_layout.cxx
	vcl/source/glyphs/glyphcache.cxx
	vcl/source/glyphs/graphite_layout.cxx
	vcl/unx/generic/fontmanager/fontmanager.cxx
	vcl/unx/generic/gdi/gcach_xpeer.cxx
	vcl/unx/generic/gdi/gcach_xpeer.hxx
	vcl/unx/generic/gdi/salgdi3.cxx
	vcl/unx/generic/gdi/xrender_peer.hxx
	vcl/unx/headless/svpgdi.hxx
	vcl/unx/headless/svppspgraphics.cxx
	vcl/unx/headless/svppspgraphics.hxx
	vcl/win/source/gdi/salgdi3.cxx
	vcl/win/source/gdi/winlayout.cxx

Change-Id: Ic629131950360e2df4c15db30d6a5362193c6330