Fix settings to honor numeric conversion errors

Rename try* non exceptioning functions to *NoEx

src/exceptions.h

@@ -85,6 +85,11 @@ class SettingNotFoundException : public BaseException {
 	SettingNotFoundException(std::string s): BaseException(s) {}
 };
 
+class NumericException : public BaseException {
+public:
+	NumericException(std::string s): BaseException(s) {}
+};
+
 class InvalidFilenameException : public BaseException {
 public:
 	InvalidFilenameException(std::string s): BaseException(s) {}