Revert v1 hardware, remove unused code for v2 hardware

Set v1 board constants

Add defines for v1/v2/v3 board compatibility

Work in progress new SMPS

Begin TI SMPS design

Remove SMPS in preparation for next attempt

Fix elrs call

Add three new OSD features: - one-letter indicator for armed/disarmed state - one-letter indicator for acro/angle mode - display "BATTERY!" in the middle of the screen once the voltage drops too much

more updates for v1 hardware

Update LEDs for v2 board, rework USB interface