Add msys2 support

[igagis]

@tanzislam

While I’ve solved it for MSYS2 / MinGW-64, it isn’t the only special environment that the user may need to enter. Cygwin, Visual Studio, Embarcadero C++Builder, and many other development tools have their own “build environments” that need to be similarly entered.

To me, the right solution for that looks like there whould be a separate image for each of those environments.