Add Hotkeys to switch tabs

Arkerthanrequested to merge
Arkerthan/fc-pregmod:tabkey into pregmod-master

As discussed in !8102 (merged)

Currently no predefined hotkeys, not sure which ones are free and make sense.

App.UI.tabBar.makeTab() and App.UI.tabBar.makeButton() were not used anymore, so I removed them and renamed the DOM versions. @lowercasedonkey This will break !8102 (merged)

Note to self: Tabs need a rework.

@i107760

Edited by Arkerthan

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