Added new formatting option: "SpaceBeforeSemicolon".
Implemented 'CS0169FieldIsNeverUsedIssue'.
Fixed bug in CS0169FieldIsNeverUsedIssue
Fix file headers.
Fix NullReferenceException in code completion.
Fixed bug in name proposal completion.
Fixed a potential null reference exception in completion.
Merge commit 'ef1a5d6314f70c8e6548af08e86663bce5424916' into NR
Adjust to new NRefactory version.