openwb-2.0: implement RFID Reset

[kaindl]

RFID-Handling is fixed in current alpha/HEAD-Version of openwb/core and will be included in Release 2.3.0.

To utilize this, we have to reset the RFID-tag on unplug.,

[kaindl]

keeping this in draft-state until I tested the changes on my openWB,

@andig, @naltatis should we merge this before openWB releases 2.3.0 so advanced users can use it already with openWBs on alpha-channel or should we keep it back until their release?

[andig]

Lets wait until expectedly supported or it will create confusion.

[MartinRinas]

would it make sense to make this revert conditionally to the installed software of the openWB, or would we rather rely on a hint in the config dialog only?

[kaindl]

@MartinRinas there is no information about the openWB-Version in the modbus interface, so there is no way to do something automatically depending on the openWB version...