Subpatch 1.3.1.3.1

Subpatch 1.3.1.3.1 is a minor update to the original Subpatch 1.3, adding extra features and bug fixes.

We're still working on Subpatch 1.3.1.3.2, but expect more exciting changes soon.

Subpatch 1.3.1.3.1.3 is a experimental version, don't even think about using it.