Oled screen to display dynamic message (Armed and connected) (#1419)

Oled screen to display dynamic message (Armed and connected) (#1419)

* Not a typo

* Showing connection state on screen

* a bit of code cleanup

* Further cleanup - code size reduction

* Better visibility of states, in line with #1412

* Back to idle screen when armed + "Disarm Plz" msg

* Bugfix on some targets

* Discarding 'Disarm Plz' (performance concern)

* Status indicator for Axis Thor TFT screen

* Use font for degree symbol

* Use common doParamUpdate/IdleScreen

* Replace TFT logo pixmap with bitmap

* updateIdleScreen now passes what changed

* Make WIFI screen mode have no timeout

* update_temp_start_time -> last_update_temp_ms

* Remove comments from oledscreen.cpp

(we have history)

* Added model mismatch colour and warning text

* Thank god for UX!

* typo in comment fixed

* Transparent bitmaps don't need background!

Co-authored-by: Bryan Mayland <bmayland@capnbry.net>
Co-authored-by: Nikhil Parikh <46944981+maybenikhil@users.noreply.github.com>
Co-authored-by: Paul Kendall <pkendall64@gmail.com>