Soft screen rotation and streamlined install

This release primarily adds support for soft rotation of the display that is required for the Pi4, at least when used with the 7" Pi display. Pi 4 display drivers don't use the frame buffer in the same way as previous models so they may not honor rotations set at the system level. This results in the native desktop displaying in one orientation but the console displaying in another. The usage notes explain how to set the screen type to use soft rotation and the installation scripts now add support for this. (Note this has been tested with the Pi 7", the 28c PiTFT, and the 35r PiTFT screens at this point but should work generally.) This provides general purpose flexibility to arrange the console screen orientation as you like easily (and since it is set at console start changing the orientation is also very straightforward).

The console install scripts have been streamlined in this release to avoid the second reboot that used to be required. This should somewhat speed up installation although the bulk of the time is still in updating the base system to current.

The release also fixes a bug when an alert screen gets invoked while in Maintenance mode, a bug in MQTT status handling. It also reworks Home Assistant restart code to insure that states are correct for changes that happened while the console was offline. Finally it again adjusts the use of Adafruit install script use to handle their changes related to a 28c PiTFT.