Add shortcuts for moving workspaces and disabling monitors

[jheuing]

This pull request adds two things to the default bindings/tiling.conf:

• Move workspaces to left and right monitors by binding SUPER ALT char:20/21. This is aligned with window resizing left and right and seemed most straight forward. Also it does not collide with any other key binding to my knowledge. Using movecurrentworkspacetomonitor l/r also seems most generic and working for all multi monitor setups, anything else would be more specific.

• Adding switch:on/off:Lid Switch disables the monitor, so it is not available in the monitor layout anymore when the lid is closed. This is only as a comment / example, as the monitor name might be different.

I am open for any feedback here to take it further if it is of general interest.