UPAI 0.9.9.3 Update

The update is progressing, but definitely behind schedule.  During test with Unity Editor 5.6, it was discovered that there were some bugs, related to causing the Unity Editor to crash.  The issues have been found and fixed, but due to the changes, I have to go back into the new editor scripts, and updates some of the functionality.

Until I'm more confident in the build, i will not post a new ETA for this release.