QS: Add Network speed indicator tile, (1/2):

Show Network speed indicator on Quick settings,
follows all options made at Settings -> Interface -> Statusbar -> Customize Network speed indicator,
except "Hide the indicator", (as the Quick settings won`t be shown all the time like the statusbar,
I decided to not hide the indicator on no traffic, maybe I`ll change this behaviour in the future).

Click:
Enable/disable Network speed indicator

Long click:
Open Network speed indicator settings

Additional:
Fix a possible FC while enabling/disabling Quicksettings

(The SystemUI will still FC while enabling/disabling Quicksettings,
but this will be fixed in a seperate commit)