Media key support (#294)

* Introduce type for KeystrokeAction

* Increment dataModelVersion

New property 'type' for KeystrokeAction

* Mapping for media keys

* Media key selecting support for KeypressTab

* refactor: Use more meaningful name (selectedScancodeOption)

* Store the keystroke type in key action type instead of a new field

shared/res/presets/VIM.json

@@ -95,7 +95,8 @@
                     "keyActions": [
                         {
                             "keyActionType": "keystroke",
-                            "scancode": 111
+                            "scancode": 111,
+                            "type": "basic"
                         }
                     ]
                 }