Merge pull request architecture-building-systems#101 from alvpickmans…

…/upgrade-sdk-proj-and-r2020

Upgrade to sdk proj and Revit2020 installer

Merge pull request architecture-building-systems#86 from mitevpi/master

Added Revit 2019 Installer & Recompiled for 2019 API.

fixes architecture-building-systems#56 (NullReferenceException on loa…

…ding)

merging @eirannejad 's facelift for the interface (now with installer)

renaming setup file

new installer for RPS 2017

mention pyRevit

mention pyRevit

Bugfix for RpsAddins without startup scripts