[uart] less macros: uart_getch function and uart_char_available static inline function
if uart is hardcoded, use function directly
[uart] defines instead of enum for baud rates again: cpp can't handle enums
[uart] get rid of all lower case Uart[01235]Foo
use only upper case for configuration and string concatenation in macros
[uart] use upper case UART[01235] everywhere
find conf -name "*.*" -exec sed -i 's/Uart\([01235]\+\)/UART\1/g' {} \;
[stm32][sys_time][ppm] run cortex systick timer at full AHB freq again, ppm at AHB/9
[sys_time] replace SYS_TIME_RESOLUTION with SYS_TIME_FREQUENCY
Merge branch 'master' of github.com:paparazzi/paparazzi into tudelft4.9