chasing bugs in the shortcut-editor for CVWidget(MS)Editor

Signed-off-by: nuss <st9fan@gmail.com>
make sure all shortcuts are displayed a CVCenterKeyDownActionEditor

Signed-off-by: nuss <st9fan@gmail.com>
make sure ScrollView.globalKeyDownAction gets reset
properly to its original value after editing shortcuts

Signed-off-by: nuss <st9fan@gmail.com>
die cocoa, DIE!
restructuring keyDownAction mechanism again...

Signed-off-by: nuss <st9fan@gmail.com>