URL and License updates (#503)

* Pull in GPLv2 from https://github.com/microtony/RTLSDR-Airband/
* Update repo URLs
* make this a #minor release

add code formatting (#465)

* add script to use clang-format to reformat all c/cpp source
* add clang formatting workflow to fail if code isn't formatted
* add clang format to development container and vscode config
* remove ubuntu-20..04 version of dev container leaving only ubuntu-latest
* add pre-commit hook
* add basic .clang-format config file
* run pre-commit checks on all files and update them
* add code formatting badge to readme

Docker updates for wiki (#464)

tweaks to docker and add sample NOAA config file

change creation of release to be only if not patch release and cleanu…

…p readme (#463)

Fix mirisdr and add to docker builds (#462)

* add installing libmirisdr-4 to both docker and CI builds
* fix warnings in input-mirisdr.cpp

Fix ci workflow names (#461)

* fix GitHub workflow names

Fix broadcom GPU build error (#459)

* change the CI build on rpi3b build to use broadcom GPU
* disable -Wcast-qual for hello_fft

Detect `RTL_AIRBAND_VERION` when building from a release archive (#456)

* add script to get version string either from git or parent dir name

Docker container not getting version string (#454)

* Fix workflow that builds docker containers so the version string compiled into the binary is accurate

Get version from git (#450)

* get version from git tag rather than hard coded in cmake