_Dependent upon completion of #1412 & #1431_ move `getDocumentState`, `shouldGenerateDefinition`, `replace`, `getSymbolCacheDir`, `navigateToSource`, `tryFindSourceUrl`, https://github.com/fsprojects/VisualFSharpPowerTools/blob/master/src/FSharp.Editing.VisualStudio/Navigation/GoToDefinitionFilter.fs
Dependent upon completion of #1412 & #1431
move
getDocumentState,shouldGenerateDefinition,replace,getSymbolCacheDir,navigateToSource,tryFindSourceUrl,https://github.com/fsprojects/VisualFSharpPowerTools/blob/master/src/FSharp.Editing.VisualStudio/Navigation/GoToDefinitionFilter.fs