Allow kickoff width and height to be set persistently through settings.

If a user wants to change the default size of 4x4 grid items to for example 5x6 resizing the applet with the super key and right click is not persistant.

This request adds width and height controls to kickoff settings which is measured in the amount of rows and columns that is displayed in the grid (also used if the list view is used instead of grid view)

These values are defaulted to the current value of 4. Which is also the minimum.

KickoffGridView and KickoffListView uses these set values now instead of the default of 4.