Make control group hotkeys configurable

- Split control groups management to its own interface
- Add hotkeys for selecting, creating, adding to and combining with control groups
- Add a ControlGroups widget to manage the player interaction

mods/common/chrome/settings-hotkeys.yaml

@@ -19,6 +19,9 @@ Container@HOTKEYS_PANEL:
 				Types: Music
 			Chat Commands:
 				Types: Chat
+			Control Groups:
+				Template: TWO_COLUMN
+				Types: ControlGroups
 	Width: PARENT_RIGHT
 	Height: PARENT_BOTTOM
 	Children: