Milestone 7.13.0 Rollback to 7.12.1! (Experimental)

[p]The 7.13.0 build recently released on the Experimental branch suffered from an issue that prevented the game loading, so we've temporarily rolled it back to 7.12.1 while we find and fix the issue.[/p][p]7.12.1 is a stripped down version of the 7.13.0 update that contains only the essential fixes, which includes a fix for the crash that was blocking Geoscape progress in 7.12.0.[/p][p]However, it's not a proper Experimental build and lacks the extra logging and automatic end of turn tactical saves - this shouldn't really affect gameplay, I'm just noting it here so regular testers aren't confused![/p]