Allow for embedding the resource file inside the executable

[slendidev]

With C23, there is now a #embed preprocessor macro that can be used to embed raw file data. It would be cool to have some functions that allow us to specify a buffer and size instead of just a file path option.

Example:
In addition to rresResourceChunk rresLoadResourceChunk(const char *fileName, int rresId), there could be a rresResourceChunk rresLoadResourceChunk(const unsigned char *buffer, size_t buffer_size, int rresId) as well.

[ERmilburn02]

Even before that, you could have just used one of the countless tools to convert the file to a C file, and compiled it into the binary. the #embed preprocessor just makes it easier.

That said, being able to load from a buffer would be useful.