partially done work on total source tree rework, separation of engine context and game context, generalization of renderer for different backends as well as web platform target

apps/testgame/build.sh

@@ -1,3 +1,7 @@
 #!/bin/env sh
 
-cmake -B .build "$@" && cmake --build .build
+if [ $1 = "web" ]; then
+    emcmake cmake -B .build-web "${@:2}" && cmake --build .build-web
+else
+    cmake -B .build "$@" && cmake --build .build
+fi