Global revision of message severity values.
Required also change to the low priority function gcs_send_text_fmt()
on GCS_Mavlink.cpp to disable the automatic setting of priority on
messages sent by this function
The PSTR is already define as a NOP for all supported platforms. It's
only needed for AVR so here we remove all the uses throughout the
codebase.
This was automated with a simple python script so it also converts
places which spans to multiple lines, removing the matching parentheses.
AVR-specific places were not changed.
* Retains ability to read from Analog Pin
* Adds ability to read RSSI from PWM channel value as is done in OpenLRSng, EazyUHF, and various other LRS.
* Handles any type of RSSI that provides RSSI values inverted - i.e. when the low value is the best signal and the high value is the worst signal.
* Has different key names from all existing RSSI parameters to provide for a clean break and easier distinguishing.
* Existing parameters are marked as obsolete
lvale
Lucas De Marchi
Siddharth Bharat Purohit
Stewart Loving-Gibbard
squilter
Andrew Tridgell