Add Module::configButton() for configuring momentary switches (which I'll now call buttons).

include/engine/Module.hpp

@@ -134,6 +134,12 @@ struct Module {
 		return sq;
 	}
 
+	template <class TSwitchQuantity = SwitchQuantity>
+	TSwitchQuantity* configButton(int paramId, std::string name = "") {
+		TSwitchQuantity* sq = configParam<TSwitchQuantity>(paramId, 0.f, 1.f, 0.f, name);
+		return sq;
+	}
+
 	/** Helper for creating a PortInfo for an input port and setting its properties.
 	See PortInfo for documentation of arguments.
 	*/

src/Quantity.cpp

@@ -40,10 +40,11 @@ void Quantity::setDisplayValueString(std::string s) {
 std::string Quantity::getString() {
 	std::string s;
 	std::string label = getLabel();
-	if (!label.empty())
-		s += label + ": ";
-	s += getDisplayValueString();
-	s += getUnit();
+	std::string valueString = getDisplayValueString() + getUnit();
+	s += label;
+	if (label != "" && valueString != "")
+		s += ": ";
+	s += valueString;
 	return s;
 }