runners: add global shortcut runner

Fushan Wenrequested to merge
work/fuf/testkcmkeys into master

A runner to perform actions from the global shortcuts, useful when an action is not assigned to any shortcut, or when the user wants to find the action name corresponding to a shortcut.

Case Screenshot
Action that is not assigned to any shortcut noshortcut
Action that is assigned to a shortcut shortcut
Reverse lookup reverse

Closes #135 (closed)

@alex

Edited by Fushan Wen

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