Add commands to easily add common sizes

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Basic

• Use last size: Allow users to trigger directly the latest used size
• Use last combination: Allow users to trigger directly the latest used combination

Advanced

• Search...: Allow users to launch Frametastic in search mode. This will enable autofocus and perform a search trough sizes allowing to use the keyboard arrows to navigate between them.
  This use-case will require first to adopt names on sizes. See Add name to sizes #3 and Add search for sizes #5