Merge pull request #1070 from mtoader/v1.0.0-alpha0

Regenerated missing files.
update copyright
Added better type inference for a call / cast expression
(cherry picked from commit 331879a)
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