MainBoard: Add servo as a design block, renumber schematic

MainBoard: Add leds and uUSB to bottom side, move the leftmost pinheads far from the board edge, fix DRC error in DRV8833 library, swap position of servos and motors + power connectors

MainBoardSCH: Change UTS, BUTTONS and IMU_INT pins, swap BUTTON-ON and BUTTON-OFF at JP21, swap SCL and SDA at X3, swap GPIO-1 and GPIO-7 between JP28 and JP30 MainBoardBRD: routing (buses, buttons and LEDs done)

Fixup string descriptors

Fix includes

Merge branch 'fw-testing' into fw-tunnel

Apply formatting

Merge branch 'fw-testing' (early part) into fw-tunnel

Apply formatting

Introduce .clang-format from rb_clang_format