Fixes and Minor rework (#132)

* Fix warning in scene trigger log functions.
* Use GetWeakSourceName() when saving scene trigger sources.
* Fix prioFuncsValid().

src/switch-priority.cpp

@@ -55,9 +55,12 @@ void AdvSceneSwitcher::on_priorityDown_clicked()
 
 bool SwitcherData::prioFuncsValid()
 {
-	auto it = std::unique(functionNamesByPriority.begin(),
-			      functionNamesByPriority.end());
-	bool wasUnique = (it == functionNamesByPriority.end());
+	auto fNBPCopy = functionNamesByPriority;
+
+	std::sort(fNBPCopy.begin(), fNBPCopy.end());
+	auto it = std::unique(fNBPCopy.begin(), fNBPCopy.end());
+	bool wasUnique = (it == fNBPCopy.end());
+
 	if (!wasUnique) {
 		return false;
 	}