Implement RMXP Extractor Into the Editor

[zimberzimber]

Implement RMXP Extractor Into the Editor

[Speak2Erase]

What formats should I support?

[zimberzimber]

I believe only JSON should be supported as it's the most well known format nowadays.
If someone absolutely needs it in another format, they can always use already available conversion tools.
And you wouldn't need to maintain more than one format converter.

[white-axe]

I'm working on a similar UI for archives so I might as well do this too.

[Speak2Erase]

This should probably wait until I finish the alox-48 rewrite. I'm currently re-doing the crate to be detached from serde, so we can have separate deserialize impls for marshal and other serde formats (json/yaml)