Fix standalone grabbers (#1384)

* Fix too much copy/paste
* Fix typo
* Commandlineoptions: Additional error details for Int and Double ranges
* Standalone grabbers: Show fps range on error, fix default host address

libsrc/commandline/IntOption.cpp

@@ -6,6 +6,7 @@ using namespace commandline;
 int IntOption::getInt(Parser &parser, bool *ok, int base)
 {
 	_int = value(parser).toInt(ok, base);
+
 	return _int;
 }
 
@@ -18,3 +19,15 @@ int *IntOption::getIntPtr(Parser &parser, bool *ok, int base)
 	}
 	return nullptr;
 }
+
+bool IntOption::validate(Parser & parser, QString & value)
+{
+	if (ValidatorOption::validate(parser,value))
+	{
+		return true;
+	}
+
+	_error = QString("Value must be between %1 and %2.").arg(_minimum).arg(_maximum);
+
+	return false;
+}