Adds warning on failing to set callbacks.

Should allow simple testing of the core.

Allows blargg's test ROM to pass.

Clarifies the boot state handling.

Also added a series of logging primitives to the TS code.

Added more pedantic validations preventing simple dummy data from being loaded.

Adds unwrap() to the run_image_test() calls.

Support for some basic Python testing.
Handling of loading error with proper error propagation.

Makes it consistent with the WebAssembly naming conventions.

These functions act as wrappers modifying the error value of the original function into a string.

Offers instructions indicating that the dependencies should be
installed before running vcpkg build.

One more time...

One more time...

Using NODE_ENV to determine if frontend code should be included in the build.

Made use of const values to store global data.
Polling is done on every tick, supposedly it's the best approach for libretro.