LAWICEL Support

[collin80]

Support should be added for lawicel serial protocol. This protocol can be used to allow the device to act as a serial canbus device for socketcan on linux. This isn't cross platform but there doesn't appear to be any harm in adding it.

[collin80]

V330 (currently in WIP) adds tentative support for LAWICEL now. It seems to work in both directions. You can't reliably set canbus speed through the slcan / lawicel interface right now but if you have your speed properly set you can then use socketcan compatible tools to interface with the GVRET hardware and it will work.

Keeping the issue open until it is better fleshed out and tested.

[collin80]

Now prototype LAWICEL V2 support is in M2RET and should be back ported to GVRET. Still, sufficient testing has not been done.