Golden gateware v0.0

- simple pulse pass-through
- remote reprogramming
- basic diagnostics
-- board ID
-- gateware version
-- state of RTM detection lines and on-board switches
-- I2C error bits
-- input line state
-- remote reset

Gateware release v1.0

- input pulse counters
- input pulse time-tagging with dedicated per-channel registers for latest
pulse timestamp
- one-wire master for accessing the on-board thermometer chip via software