Remove RTCM code from build for now.

This is being replaced with the code in libswiftnav.
Formatting.
Send observations in new more compact format.
Revert "Revert "Update observation view for new observation message format.""

This reverts commit 366e9a9ad6ee52f97c95e8ee90162f33b46cfbe6.
Move SBP thread to sbp.c, add UART monitoring code (reports CRC errors and buffer %).
Add function to send baseline and ons callback.