Big update (See commit details)

[bensuperpc]

I made some modification for my needs, if you are interested:

Here are the main changes:

• Add github action for Linux, MacOS, Windows
• Add github action for cross platform (ARM, RISCV, PowerPC ect...) with dockcross
• Add Google test and Google benchmark, to avoid regressions with units test
• Add CMake (Shared or Static ThreadPool library), can be installed (Tested only on ArchLinux/Manjaro and ubuntu 21.10)
• Add optional CMake Presets (CMake 3.19 min)
• Add Examples
• Improve Readme
• CMake library based on cmake-init
• Improve warning message with MSCV
• Update readme README.md

Signed-off-by: Bensuperpc [email protected]