UETOOL-213 - Minimize Slate FString -> FText conversion (remove SLATE_TEXT_ATTRIBUTE)
This fixes any editor/engine specific code that was passing text to Slate as FString rather than FText.
[CL 2399803 by Jamie Dale in Main branch]
Remove requirement for blueprint node name pins to be non-numeric values (this requirement seems to no longer be present in other areas of the engine)
Modified SGraphPinNameList to use new SNameComboBox class
[CL 2266949 by Joe Conley in Main branch]