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

Makes it consistent with the WebAssembly naming conventions.

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

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

Fixes issue with zip file handling.

Making use of the newly added `buildRomData()` method.

Making use of the newly added `buildRomData()` method.

This has been moved to emukit.

Uses js-sys to interact with the Javascript VM, to obtain Date() reference.

Makes use of the most recent save state support in EmuKit.
Thumbnail image support.

Using static methods instead of global functions.