Bug 571649 - Make "swap left & right" action accessible

Register the action as a command. This enables users to define a key
binding for it, and makes the command show up in Quick Access.

While the command name is "Swap Left and Right View" the description
uses the expression "Switch sides" on purpose as it makes it easier to
find the command since there are more different search words that can
be matched.

Change-Id: Ic5713ccb434224536545f97545f7c2f3d0dfd6d3
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
3 files changed