Remove the redundant tlmConfirm bit in PACKET_TYPE_LINKSTATS. The extra byte in the linkstats packet returns fullres telemetry bandwidth back to where it was in 3.x, and also use this packet in standard res modes to provide massive bandwidth increases for low telemetry rates.

Also refactor all names to be consistent where the old "MSP" referred to any data uplink packet and the old "telemetry" referred to any data downlink packet. TelemetryStatus is the same as tlmConfirm, so unified their names as well as stubbornAck.

WARNING: Breaks 4.0 OTA compatibility

This rejiggers many OTA structures. The RX and TX MUST use the this PR or above as mixing prior versions will result in no telemetry (at the best) or crashes.

Redundant Bit

tlmConfirm was present in the OTA_LinkStats_s structure, as well as in the surrounding data_dl union. This was used somewhat inconsistently throughout the code on both sides of the connection. We only need one, so it is now just in the data_dl union along with the packageIndex. The trueDiversityAvailable bit was moved into the OTA_LinkStats_s structure.

Increased Telemetry Bandwidth

This is what you're all reading this for, right? Fullres modes get their 1 byte back in the linkstats that was commandeered during OTA 4.0 development, so it is just back to where it was in 3.x (apart from the 4.0 Gemini boost obviously).

The real star of the show is the clear byte in the standard res packets that was just carrying the trueDiversityAvailable flag. This is now being used as additional payload for data downlink, similar to the way fullres splits the packet. It is just one byte but far more important is that it increases the number of data downlink transfers from 2 to 4 per second when using Std telemetry. Given that any downlink transfer takes a minimum of 2 packets, this is a massive increase.

Time to transfer all Betaflight telemetry items (VBat, FlightMode, VSpd, GPS, Attitude / 14 sensors):

• 6657 -> 5120 ms 500Hz Std ANT1 (30% increase)
• 5119 -> 3072 ms 500Hz Std Gemini (66% increase)
• 6656 ms in 3.x.x regardless of antenna mode

Low (1:128) rates benefit the most and the benefit scales down at higher rates. 1000Hz 1:2 is only a 0.4% theoretical increase.

Refactor / Rename

Some old comments referred to old OTA packet fields. Much of the code referred to uplink data as "MSP" regardless of the fact it usually was CRSF. Downlink data was referred to as telemetry. Everything is now standardized to "data_dl" or "data_ul".

All of the data downlink OTA generator and data uplink OTA processor code was refactored to use common code. The RX's downlink was a real problem to keep together due to how many objects were needed, so it just became a preprocessor macro for readability. The TX's code is a few hundred bytes smaller.