Get Rive tests compiling and running on MSVC

- Adds template classes to polyfill missing vector extensions.
- Removes other language features not supported by this compiler.
- Fixes or suppresses various new warnings.
- Adds a GitHub action to compile and run the runtime tests on MSVC.

Diffs=
2a53e702a Get Rive tests compiling and running on MSVC
1733f0c5a Add Mat2D::mapPoints, optimized in SIMD

tess/src/sokol/sokol_tess_renderer.cpp

@@ -66,7 +66,7 @@ public:
         {
             for (auto& subPath : m_subPaths)
             {
-                reinterpret_cast<SokolRenderPath*>(subPath.path())->drawStroke(stroke);
+                static_cast<SokolRenderPath*>(subPath.path())->drawStroke(stroke);
             }
             return;
         }