implement set videomode via json api (#457)

* implement set videomode via json api

* refactor grabbers:
- new base class
- move shared code to base class

* fix osx

* rework all cmakelist files with auto file collection. except leddevices (need further restructuring)

* store current video and grabbing mode

* add json stuff

* remove grabbingmode - we do not want to expose it

src/hyperion-remote/JsonConnection.cpp

@@ -576,6 +576,16 @@ void JsonConnection::setLedMapping(QString mappingType)
 	parseReply(reply);
 }
 
+void JsonConnection::setVideoMode(QString videoMode)
+{
+	QJsonObject command;
+	command["command"] = QString("videomode");
+	command["videoMode"] = videoMode.toUpper();
+
+	QJsonObject reply = sendMessage(command);
+	parseReply(reply);
+}
+
 QJsonObject JsonConnection::sendMessage(const QJsonObject & message)
 {
 	// serialize message