File version cleanup

This is a small bugfix update. I got a report of the GMS2 source code being broken and tracked it down to a change introduced in the GMS2 2.1.4.218 runtime. I've uploaded a new v1.2 version of the source code which is freshly imported from GMS1 to GMS2, and it seems to solve the problem (which appears to have been caused by changes in how a compatibility script gets compiled, but I've not been able to confirm it's the root cause).

If you haven't seen problems in your game, you should be fine and don't need to do anything. I'm just posting this devlog so you don't get confused over the page being updated. There are no GML code changes between the old GMS2 source file and the new GMS2 source file.

Furthermore, since it was getting messy to have 5 different versions of the source code available and two of them were known to have problems when imported in GMS2, I've hidden every version except the most recent so it's more easy for people to know which version to download. Don't worry: if for some reason you need any of the old versions, I'll make them available on request.