SaveState getUndoRedoState() {
		return bbcm.getUndoRedoState();
	}
Send a notification that a byte block edit occurred.

@param block block being edited
@param index offset into the block
@param oldValue old byte values
@param newValue new byte values
Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/byteviewer/ProgramByteBlockSet.java