Bug 970404 - don't let users affect document colors for chrome images, r=bz, a=sylvestre

--HG--
extra : rebase_source : f31dad860882e1f16887c5e463c78cb3b56c3723
Bug 963576 - Part 1 - Provide attributes/classes to style Australis' customization targets. r=Gijs, a=gavin
Bug 963576 - Part 2 - Add an outline on entering Australis' customization mode or upon hover/drag over customization targets. r=Gijs,mconley, a=gavin
Bug 979053 - fade in navbar and placeholder outlines when opening Australis customize mode, r=MattN, a=sylvestre
Bug 978050 - fix the hovered outline-color for Australis' customize mode's drag indicators for tabsintitlebar menubar/tabstoolbar to be the caption text color, r=MattN, a=sylvestre
Bug 978048 - remove the tabstoolbar and menubar dragarea indicators for Australis customize mode, r=jaws, ui-r=phlsa, a=sylvestre
Bug 978084 - Make sure Australis' customize mode's @customizing-movingItem gets removed by ensuring dragend gets fired. r=Gijs, a=sylvestre
Bug 979953 - [Australis] Remove bold formatting from tab titles. r=MattN, a=sylvestre
DONTBUILD
bug 975807 - fix the margin of the dropmarker for combined toolbar items on Australis. r=jaws, a=sylvestre