* reset position by fusion
* handle local_pos_valid for fixed wing in gnss denied
* [WIP] ekf2: setEkfGlobalOrigin respect current height reference and vertical position aiding
* global origin, also reset vertical pos without gps as ref
* fix wo gnss, that bitcraze ci passes
* revert some changes as requested
* remove duplicate reset messages
* undo unrelated whitespace changes, I'll fix it everywhere in a followup
* [SQUASH] ekf2: add vehicle_command_ack
* resetGlobalPosToExternalObservation consolidate logic
* remove gnss check from local_pos validation check
* reset when 0<accuracy<1, otherwise fuse
* replace gps param with flag
* ekf2: dead reckon time exceeded, respect ZUPT preflight if air data or optical flow expected
* subtract timeout from last inertial dead-reck, change fake pos conditions, save flash
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Co-authored-by: Daniel Agar <daniel@agar.ca>
