Adds enhanced autotools build system used by openthread and openweave projects:

* Package management: 'make dist' and 'make distcheck'
* Cross-platform handling: (Linux, Darwin, iOS, Android, embedded arm, etc.)
* Multiple compiler support: clang, GCC
* Integrates automated testing framework: 'make check'
* Code style enforcement: 'make pretty' and 'make pretty-check' integration with clang-format

Implement a QRCode payload generator

Merging based on 3 approvals from separate member companies.

Import software update manager generic code

Change to multi level include directives for platform headers

Import generic implementation of connection manager

Thanks, merging based on 3 approvals.

Add tidy and format to make rules

Merging based on 3 approvals, thank you!

update .clang-format, re-format src/. accordingly

Merging based on 3 approvals, thanks!

Replace 'run_tests' with the More Familiar 'check' as the make Target

Merging based on 3 approvals, thanks!

tidy up clang_tidy

Merging based on 3 approvals, thanks!

Replace 'run_tests' with more familiar 'check' as the make target for running unit and functional tests.

run shellcheck on run_clang.sh

Merging based on 3 approvals, thanks all!

Add shellcheck github action for PRs

Merging based on 3 approvals, thanks!

Device layer generic code

Thanks, merging based on 3 approvals.

Remove cppcheck rules

3 approvals, merging