Merge branches 'master' and 'mcattin_dev' of github.com:mcattin/cvora into mcattin_dev
hdl: Work on the registers. Renaming in progress.

- mode is now 4 bits
- no default mode with jumpers
- all fp inputs sync'ed with gc_sync_ffs
- data from interface controller sampled on rising edge of sys_clk
hdl: Continue clean-up.

- simpler pps counter
- gc_extend_pulse for LED monostable
- generic up/down counter module
- clean sci decoder (was P2Serial)
- add cvrob decoder (from Damien Perrelet BE/RF)
- more renaming on top level