[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