[WIP] Add initial settings page
Created by: JBBgameich
I started this earlier already but finally found time to bring it to a pull-requestable state. On desktop systems, the settings are displayed as a popup, like in Telegram Desktop. On phones, settings are displayed on a new layer. Currently no real settings are included. Ideas for settings:
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Chat background image -
XMPP console (although I'd like to hide that in some sort of developer options)
Mobile behaviour (I'm not yet sure how you can leave the new layer on android...):