Clarify the HAL_adc_get_result method to make sure correct values enter the filters

HAL: Fix the PID control loop for non-AVR platforms

Prevents user from having to manually run through entire manual leveling process only to enable mesh so they can manually restore their offline mesh backup

Followup to 19e75ccf86

Clockwise arrow fixed

Based on #9030

minor edits to force new Travis test (last one timed out)

Update u8g_com_HAL_DUE_st7920_sw_spi.cpp

initial power up display garbage gone

found a few more nasties

Formatting tweaks

correct array initialization & remove test code

Based on #9008

Fix #8901

Now the USB MSD can transfer at 750k/s. Previously, it was 500k/s. I think this is the maximum achievable speed using Sw SPI.