[4.1 only] Implement frames management action

The full list of new actions:
1) Insert Keyframe Right
2) Insert Keyframe Left
3) Insert N Keyframes Right
4) Insert N Keyframes Left

5) Remove Frame and Shift
6) Remove Frame

7) Insert Column Right
8) Insert Column Left
9) Insert N Columns Right
10) Insert N Columns Left

11) Remove Column and Shift
12) Remove Column

I will probably change the naming of some actions in the future when
other planned actions like "Add/Remove hold frames" is implemented.


CC:kimageshop@kde.org