Interior Editor Beta updated w/ major bugs fixed

Hey folks! I updated the Beta branch and fixed the major issues some of you were seeing.

Most importantly, you should be able to load saves now without seeing all of those errors, missing interiors, bad player locations.

I also fixed a bug that broke tall walls.

Finally, I fixed at least one crash!

I am going to continue fixing things - you guys have reported bugs about crashing while in the editor, and a few minor bugs. Will be looking into them next! Thank you all so much for all your help so far!

To test, go to Steam Library -> right click Rodina -> Properties -> Betas tab -> Choose "Beta" or "Dev" from the dropdown.