Alpha 5, misc fixes with engine v1.2.2

@Cervator Cervator released this Oct 8, 2016 · 2300 commits to develop since this release

This is a relatively small patch release to create the Alpha 5 build, which goes with our 5th birthday festivities - fitting coincidence!

Most the changes covered can be reviewed at - I clearly need to stop attempting releases past 2 am, terrible for formal change notes! :-)