The following changes have been made:
1. Replace deprecated functions with new standard functions
2. Add corresponding MSVC functions for non-standard functions
3. Remove warnings about unsafe functions
4. CMAKE: modify find pack Libevent and openssl
5. Modify include files
6. Use pthread4W
7. Modify socket in windows
8. Add CI - github action
8.1. msvc
8.2. mingw
10. The database:
9.1. sqlite, pgsql, hiredis, mongo is test compiled.
9.2. mysql, isnot test compiled.
11. The applications、server can be compiled and run successfully!
12. Add vcpkg manifest mode in cmake.
Install dependencies and build with prometheus support during CI builds
Ubuntu 16.04 has issues supporting `MHD_USE_EPOLL_INTERNAL_THREAD` so
disabling it (using SELECT)
Should not impact anything as the only reason we use Ubuntu 16.04 is to
validate build against openssl-1.0.2
Fixes #998
- omit publishing and releasing Docker images in forks
- verify Git tag to match Makefile before releasing
- auto-cancel concurrent CI pipelines for the same Git ref
