Implicit conversions are a dangerous cause of confusion as seen
in http://markmail.org/thread/a4copx2di7cxeowg and require tricky
rewrites to work around them, this change cleans them up and
disables them.

(cherry picked from commit 2d9d5c8d)

Conflicts:
	filter/source/graphicfilter/egif/egif.cxx
	filter/source/graphicfilter/epbm/epbm.cxx
	filter/source/graphicfilter/epgm/epgm.cxx
	filter/source/graphicfilter/ipbm/ipbm.cxx
	filter/source/graphicfilter/ipsd/ipsd.cxx
	sd/source/ui/slidesorter/view/SlsButtonBar.cxx
	svtools/source/filter/igif/gifread.cxx
	svtools/source/filter/jpeg/jpeg.cxx
	svtools/source/filter/wmf/winwmf.cxx
	svtools/source/graphic/grfmgr2.cxx
	vcl/inc/vcl/bmpacc.hxx
	vcl/inc/vcl/salbtype.hxx
	vcl/source/gdi/bitmap.cxx
	vcl/source/gdi/bitmap3.cxx
	vcl/source/gdi/outdev2.cxx

Change-Id: I1d163c66782c2750aeee00725dbb2b614507c0d4
(cherry picked from commit ff80c37b18b941712fb967a0c1d48813b47c0583)