* changed GHA runners to ubuntu-20.04 since glibc is too new in 22.04
* updated gitignore to exclude CMake and more C++ temporary files
* adjusted scripts' permissions
* created express Makefile to easily build for different arch
* automatically clone ASIO source code using CMake
* updated Raspberry Pi configuration docs
* fixed P25 garbled encrypted voice due to incorrect HDU MIs, frame type predictions, and clear null IMBE frames
* removed ASIO clones from pipelines
* reorganized files into appropriate directories
* updated README, AUTHOR, and LICENSE to conform to conventions
* adjusted CMakeLists and pipeline for the new directory structure
* moved examples->configs; scripts->tools; src/debian->/debian
* updated authors information
* created new section in author information
* removed deprecated iden_channel_calc tool
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