Now displays receive time of incoming messages

Noted the layering of switching between tx/rx might be sub optimal

Fine tuned settings when sharing MiHome and legacy devices

Renamed new radio2 module as radio, and removed old code

Removed any remaining spi-direct and tidied the build process. ...

Tested monitor.py, switch.py and legacy.py on Raspberry Pi.
All work from the same driver now.

Removed legacy direct-to-SPI interface. ...

This code now does FSK tx/rx and OOK tx from the same driver.

Tested FSK tx and rx on Pi, works fine ...

Tested both monitor.py and switch.py

Fixed compile typos. ...

Build test done on mac

Simplified the choice between len and cbp receive

Updated TODO list for next steps of radio.c

Implemented radio.c/radio_get_payload ...

Not yet tested

Implemented a better HRF_readfifo_burst. ...

This has facilities to read a fixed payload, or a count byte preceeded payload.

Framework for FSK receive in place

Started working through new FSK receiver architecture

Tested with MiHome adaptor plus, new FSK transmitter works fine

FSK Transmit coded, ready for test

Restructured switch.py so we have a tx-only test. ...

This is in preparation for pushing the FSK transmitter into radio.c

Refactored so that we can create a tx-only switch loop tester. ...

This will be useful for integrating a new FSK transmitter without receiver

Tested on Raspberry Pi, switch, monitor, and legacy work with spi scaffold

radio2.py offers temporary spi interface for radio.py ...

Tested on mac only.

Build of radio_rpi.so updated

Removed experimental arduino work

Fixed failed merge

Merge branch 'long-tx'

Improved configurability of message repeat patterns. ...

Tested with different repeat lengths.
Optimum seems to be 8 inner, 1 outer transmits

Turned off TRACE on raspberry pi build

Tested with learning mode. ...

Works with all 4 switch patterns.
Can now independently switch 4 switches.
Some occasional RF reliability problems that need measuring.

Implemented mode switching logic. ...

This is so you can just say radio_standby()
Then radio_transmit() and it pops to standby at end of transmit.
Or, radio_receive()
Then radio_transmit() pops back to receive at the end.
Also massive tidy up and trimming out old comments.

Improved flow of code, specifically radio_transmit() ...

Pushes previous mode and restores at end of transmit.
This should auto-return to standby or receive as appropriate.
This will make it easier to implement mode hopping schemes later.

Simulation gets further now due to gpio_sim detection