Include assets into binaries

Instead of using the directory of the binary in a fixed way to load resources/assets from the same directory (mentioned in #83 (closed)), I suggest it makes more sense to compile the resources/assets directly into the binaries. This is partially already possible in case of shaders to simplify modules with custom stages/pipelines. So it shouldn't require huge changes for other assets as well.

added 🔥 Resource Management 🖥️ I/O labels

I would also suggest that in case textures and others assets can not be found, there will be a default value as potential replacement. So the application does not just crash if not explicitly specified.

mentioned in issue #146

This seems to be a good solution for this issue: https://github.com/vector-of-bool/cmrc