Support match lambda expr (function keyword)
Renaming
Adding documentation
Update option page
Simplify code
Finalize documentation
Fix option page behavior
Update option page

* Changed screenshot
Fix bug
Fix documentation issue
Merge pull request #466 from OkayX6/match-lambda-pattern-gen

Support match lambda expression (function keyword) & update documentation
clear FCS caches when a solution is opened
replace ProjectProvider.ReferencesChanged with a callback function
clear ProjectFactory cache on solution closing
VSLanguageService clears FCS caches on solution closing instead of opening, which caused VS freeze on loading large solutions
Merge pull request #477 from vasily-kirichenko/fix-memory-leakages

Fix memory leakages
translate saved current word span to the current snapshot in HighlightUsageTagger

*
SyntaxConstructClassifier unsubscribes from OnBuildProjConfigDoneEventHandler if doc.TextBuffer is null
remove redundant assertions
Dispose classifiers correctly