Add crsf-telemetry filtered queues

[wimalopaan]

This PR tries to implement #5757

It introduces the following new lua functions:

• crossfireTelemetryCreatePrivateQueue()
• crossfireTelemetryPopPrivate()
• crossfireTelemetryRemovePrivateQueue()

and it changes (non-breaking) to interface of

• create()

of lua widgets.

For lua widgets that use crossfireTelemetryPop() nothing changes.

The create(zone, options) function gets a third parameter create(zone, options, widget_id). The widget_id is a unique widget-identifier, that will be used in the other three new lua functions.

• crossfireTelemetryCreatePrivateQueue(widget_id, filter_table)

inserts a new filter for the widget with the id widget_id. filter_table can contain up to 8 bytes that are compared against the first 8 bytes (startung with the length byt eof the frame) of an incoming crsf packet. 0 values serve as wild-cards. If a crsf-packet matches it is sorted out into the according private queue.

This function returns error codes:

• -1 if an equivalent filter already exists,

• -2 if no more private filter queues are possible (up to 8 filter queues are possible)

• crossfireTelemetryPopPrivate(widget_id)

extract a crsf message out of the private crsf message queue for widget with widget_id. Return values are the same as for crossfireTelemetryPop().

• crossfireTelemetryRemovePrivateQueue(widget_id)

removes a private crsf message queue (this also happens automatically if the widget is terminated).

[wimalopaan]

Attached is a lua widget to test

crsfqueue.TGZ

[pfeerick]

What happened with the reversion of #5788 in the last commit?

Are you happy with how this is working now?