Faster completion by not iterating over full class index for each package
Added indices for functions and properties in package and used them to speed up completion
Classes by package index now contains only top-level classes
Renamed two index classes for consistency
Dropped index which is not needed anymore
Dropped 2 more not needed indices
More correct implementation PsiShortNamesCache (although I do not know if it matters at all)
More simple and effective top-level declarations by name search
2 more indices not needed anymore
Fixed JetDeclarationStub.getParent() which was incorrectly implemented before