Completely changed XFillBitmapItem to work with GraphicObject, removed XOBitmap
class, adapted all usages (also the pretty old 8x8 pixel editor).

All Bitmap fill styles will now accept transparent bitmaps as fillings in all
variations (tiled, etc.). LoadSave is no problem, ODF defines graphic as
content for fill.  Backward means that OOs before this change will use a white
background of fill with transparent, same as the fallback all the time when
using a transparent fill.

This is also a preparation to e.g. offer SVG or Metafiles as fill style.

Conflicts:
	cui/source/tabpages/backgrnd.cxx
	cui/source/tabpages/tparea.cxx
	cui/source/tabpages/tpbitmap.cxx
	filter/source/msfilter/msdffimp.cxx
	filter/source/msfilter/svdfppt.cxx
	sc/source/filter/excel/xiescher.cxx
	sd/source/ui/func/fupage.cxx
	svx/inc/svx/dlgctrl.hxx
	svx/inc/svx/xbitmap.hxx
	svx/inc/svx/xbtmpit.hxx
	svx/inc/svx/xtable.hxx
	svx/source/customshapes/EnhancedCustomShape2d.cxx
	svx/source/dialog/dlgctrl.cxx
	svx/source/svdraw/svdograf.cxx
	svx/source/tbxctrls/fillctrl.cxx
	svx/source/unodraw/XPropertyTable.cxx
	svx/source/xoutdev/xattrbmp.cxx
	svx/source/xoutdev/xtabbtmp.cxx

Change-Id: Id838bfbacc863695d078fb3cf379d1c0cd951680