MPS-17608 model properties dialog issues
add generator to new language by default
MPS-17619 No way to decide which stub model to import when there are several models with the same fqName.
Better handling position in psi tree
MoveInnerClass refactoring works with MPS
IdeaPlugin.mps solutions: added more necessary module imports
getContainingFile and getTextRange return values for detached mps psi elements
Now detaching parts of PSI tree doesn't break find usages, etc.
MPSReferenceSearch now uses mps.FindUsagesManager correctly