tooltips: less branching when setting anchor
tooltips: fix set backdrop
unitframes: fixes for rogues, dks, and paladins
actionbars: let rActionBar handle frameVisibility defaults
actionbars: allow show on mouseover
unitframes: every frame is toggleable
nameplates: comprehensive check for forbidden before styling
nameplates: check for secure before styling
effectively disables styling in dungeons
nameplates: fix set texture rgb
tooltips: fix blinking border
fixes #55
actionbars: allow partial load of bars