* gz: use server config file for loading world plugins
* submodule
* use server.config in tree
* newlines
* format
* gzbridge: rename function
* format
* gzbridge: add magnetometer callback
* change gz_find_package to find_package
* fix up directory structure and cmake to allow multiple plugins
* newlines
* add comment block explaining gz_env.sh
* remove dupe readme
* remove SENS_EN_MAGSIM from all gz airframe files except spacecraft
* update gz submodule
* disable SENS_EN_GPSSIM for all gz airframes
* add GPS + noise to GZBridge
* remove mutex from gz callbacks. Callbacks run synchronously after sim update step and run() loop does not share resources.
* remove hrt check in callbacks
* format
* remove param set-default for already default params
* update submodule
* remove unnecessary comments
* overhaul of the GZBridge and px4-rc.simulator script
* remove arg
* shellcheck disable
* add bus/address
* start gz_bridge before adjusting sim speed or camera follow
Jacob Dahl