Silenced MSVC LNK4221 warning about empty compilation units. Such units appear because they are used for basic validation of header files that only contain e.g. template code.

Added gsl::narrow calls where MSVC warned about numeric conversions that could potentially lose information.

Use snprintf instead of sprintf to avoid security warnings regarding buffer overflow potential of sprintf.

Windows CI tasks are enabled by defining the project variable WINDOWS_CI.

Check for MinGW in particular instead of for any GNU compiler to decide if we need to link against mingw32.

This condition should be more precise, considering other potential environments like cygwin.

Merge branch 'feature/windows_and_msvc_support' of gitlab.com:lowkey42/mirrage into feature/windows_and_msvc_support

Set VS_DEBUGGER_WORKING_DIRECTORY and VS_STARTUP_PROJECT to make usage with Visual Studio more convenient.

Don't list embedded_assets.s as an output for embedded_assets.zip custom command to prevent build system from deleting this file, that is only created during CMake configuration, when performing a clean build.

The embedded_assets.s is still touched to trigger a rebuilding of the corresponding OBJ, but it is created using file(GENERATE ...) instead of by the custom command.

Because MASM doesn't support an equivalent of .incbin,
the workaround uses a mingw assembler to create the asset OBJ,
even when the rest of the program is built using MSVC.