Unable to test project saving about skaa_editor

[sraboy]

I've been learning the file formats and structure as I go so this is due to architectural issues. I wasn't able to plan out the design properly so stuff was just added hodge-podge. I was hoping to push this off until at least the first beta release, if not 1.0, but the plan is to migrate to MVP. It's becoming harder and harder to hack things together and I'm wasting time fixing things I broke by adding a planned feature so this will probably happen sooner rather than later.

I've mocked up the design but still have a few quirks to work out and need to write the interfaces. I'd like to move a lot of the controls to separate libraries since I've made them generic enough to be useful elsewhere. This will allow working on UI features in the controls irrespective of what new stuff pops up as I dig into the individual file types and how they're used in-game.

[sraboy]

This can now be tested in the latest build, which is based on MVP. The Open method can't be tested since it relies on the various presenter classes' integration of Open/SaveFileDialogs but that's just to make things cleaner/easier in the main form. Everything else is simple enough and the presenters have separate Load methods that can be tested as well.