Do not resolve invalid elements
Move sdk classes
clean up
Initial GOPATH-library implementation
nullable
#1022: rework variable resolution
Add empty configurable for libraries
Show notification on detecting GOPATH
Add libraries as a sources
Infer nullity
update idea version
Initial resolve base test.

Once we think this is a good idea i'll port the rest of the resolve tests and file tickets for broken functionality.
Added .idea/workspace.xml to .gitignore