backdrop api: rework every single frame sizing

This commit breaks alot of compatibility and maybe
other things too. The change was necessary, because
the old framework ran up against its limits.
A lot of new configuration options are now possible
and some of them were already added.

pfUI.toc

@@ -29,6 +29,7 @@ modules\actionbar.lua
 modules\chat.lua
 modules\font.lua
 modules\addons.lua
+modules\minimap.lua
 modules\panel.lua
 modules\player.lua
 modules\target.lua
@@ -37,7 +38,6 @@ modules\pet.lua
 modules\group.lua
 modules\raid.lua
 modules\castbar.lua
-modules\minimap.lua
 modules\skin.lua
 modules\xpbar.lua
 modules\autoshift.lua