[Refactor] First attempt at new si tranceiver library. Not tested
[New Feature] Added initial implementation of olivia for testing
Merge branch 'master' into si4060-tidy

Conflicts:
	firmware/src/main.c
[Refactor] Now uses si_trx for the radio
[Refactor] Rename GPIO function, reduce radio pin drive strength
[Refactor] Completed replacement of Si4060 with si_trx
Merge branch 'master' into contestia_dev
[New feature] Generally working olivia / contestia implementation. Only decodes sometimes... Maybe needs a preamble?