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

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

Made the testing of the timer work.

Also made some initial timer validation.

Including version and complier info.

Makes it consistent with the WebAssembly naming conventions.

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

Converted the `state.rs` into an Error enum version of result.

Makes use of the `Error` enum to handle errors. This is a better way to handle errors in Rust. It is also more idiomatic.

Contains detailed information about the inner structure.

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

Added more error handling.

Added support for pyboy event conversion.

PyBoy interface was also updated with a mapping table.

Makes it easier to interact with the base py.rs file