Blender Git Loki

2.5: various one-liner fixes

* Image window only show game properties in game mode.
* Fix image window render info drawing wrong with alpha enabled.
* Win32 editmode cursor now uses a different one than the system
cursor, that one is barely visible, especially in the new theme
colors.
* Center text in operator header print.
* Fix sequencer unlock shortcut key.
* Fix uv layer / vertex color active render button now graying out.
* Workaround to get default zoom level 1:1 again for new buttons
(will try to fix properly later, is due to scrollbars).