update FCS to 0.0.50

uncomment LanguageService test checking find usages of properties with explicit getters / setters
Fix getting symbol usage scope

Close #471.
Merge pull request #472 from vasily-kirichenko/FCS-0.0.50

update FCS to 0.0.50
Add IsForStandaloneScript property
Merge pull request #473 from dungpa/standalone-scripts

Fix getting symbol usage scope
Merge remote-tracking branch 'fsprojects/master' into graying-unused-declarations

Conflicts:
	src/FSharpVSPowerTools.Logic/FindReferencesFilter.fs
	src/FSharpVSPowerTools.Logic/ProjectProvider.fs
	src/FSharpVSPowerTools.Logic/RenameCommandFilter.fs
fix compilation