Hello,
It seems that this is not so difficult. I commented out the whole calendar api and did some other minor corrections and it seems that it works now with 8.5.3FP4.
I would like to contribute this, but currently i'm not so familiar with github & branching, used only svn so far. So maybe someone can give me some hints how to begin (and NOT to mess up the repository :)
I also do not know what's the best way to compile it. In 8.5.3 designer i got a lot of warnings (yelow triangles). In a stand alone eclipse I could not compile it. (As far as I know now, I should have installed the SDK)
Best regards
Roland