Split INVERTER_PIN_UART<n> into INVERTER_PIN_UART<n>_RX and
INVERTER_PIN_UART<n>_TX. This allows us to invert just one line
of the port in F4 based controllers, like we can do on F3.
Fixes#3466
Code by @conkerh, @jflyper and @mikeller
Only F4 and F7 are supported, since this feature takes ~9K of flash
and F3 only has ~15K free right now.
Use the new 'msc' CLI command to enable MSC mode. The FC will reboot
as a USB mass storage device. To exit the mode, just power cycle.
* Initial cut on cleaning up makefile and libraries.
* F3, F4, F7 support
* Add 'make release' to build targets for release
* Introduce BUILD_SUFFIX options; Comment fix
* Fix USB core
* Fix F7 warnings
* Clean up STM32F1 code
* More cleanups of unused files