Moved the "GoToDocumentation" command from MaterialEditorCommands up to GraphEditorCommands.
#jira UE-11783 - Right click on BP nodes should offer link to API docs for node.
[CL 2506859 by Michael Schoell in Main branch]
#change UK2Node_CallFunction::GetFunctionGraph now returns the proper graph from whatever Blueprint the function belongs to
#change Cleaned up double clicking on function call nodes
#ttp 316688 - UE4: BLUEPRINTS: Go to definition behavior should be available in the right-click context menu for function calls
[CL 2270980 by Michael Schoell in Main branch]
#Branch UE4
#Proj BlueprintGraph, GraphEditor, Kismet, UnrealEd
#Summary Added code to navigate the users IDE to native functions and variables. Added options in the graph and myblueprint node context menus to navigate to the native code they represent.
#Add Added function FSourceCodeNavigation::NavigateToProperty to locate and open the header file where the variable is defined.
#Add Added function FSourceCodeNavigation::NavigateToFunction to locate the source code from the symbolmap and open the IDE at the definition location.
#Change Moved the code used to determine the correct modulename from FSourceCodeNavigation::GatherFunctionsForActors to FSourceCodeNavigation::FindClassModuleName so other functions didn't have to replicate the code.
#Change added Goto Code Definition for native variable nodes and native call_function nodes in the blueprint graph node context menu.
#Change added Goto Code Definition for native variables in the myblueprint node context menu.
#Add Added GotoNativeFunctionDefinition, IsSelectionNativeFunction, GotoNativeVariableDefinition and IsSelectionNativeVariable to FBlueprintEditor so the context menu actions can call these functions to goto source code.
ReviewedBy Chris.Wood
[CL 2044026 by Ben Cosh in Main branch]
