Add CMake support and fix winmain.h missing problem

[LonghronShen]

• Add CMake support
• Fix winmain.h missing problem
• Generate a script to run all examples easily

With CMake support, native/cross platform building can be easily done. Built on:

• Windows(VS/Clang-cl)
• Mac OS X
• Linux (amd64, arm64 mipsel)