- removed obsolte txamp functions (re DAC enable sequence)
- reorderd TX enable sequence
- consolidated time keeping (ticks/time vs sample count)
  - added RX_ and TX_ prefixes for samples counts
  - added new data type rx_sample_cnt_t
  - renamed function to calc rx lag for more clarity
  - deactivated downsampling (locked feature, almost all steps made)

fixed a bug that accidentally included (empty) sim bootloader instead of platform bootloader; stripped down makefile and removed stm-legacy makefile alltogether; yet need to shift stuff from platform makefiles to generic one