Stop LedDevice:write for disabled devices + Nanoleaf Fixes (#629)

* Handle Exceptions in main & Pythoninit

* Have SSDPDiscover generic again

* Have SSDPDiscover generic again

* Change Info- to Debug logs as technical service messages

* Nanoleaf - When switched on, ensure UDP mode

* Include SQL Database in Cross-Compile instructions

* Fix Clazy (QT code checker) and clang Warnings

* Stop LedDevice:write for disabled device

* Nanoleaf: Fix uint printfs

* NanoLeaf: Fix indents to tabs

* NanoLeaf - Add debug verbosity switches

* Device switchability support, FileDevice with timestamp support

* Nanoleaf Light Panels now support External Control V2

* Enhance LedDeviceFile by Timestamp + fix readyness

* Stop color stream, if LedDevice disabled

* Nanoleaf - remove switchability

libsrc/leddevice/dev_other/LedDeviceFile.h

@@ -36,6 +36,13 @@ public:
 	virtual bool init(const QJsonObject &deviceConfig);
 	
 protected:
+	///
+	/// Opens and configures the output file
+	///
+	/// @return Zero on succes else negative
+	///
+	///
+	virtual int open();
 	///
 	/// Writes the given led-color values to the output stream
 	///
@@ -47,4 +54,10 @@ protected:
 
 	/// The outputstream
 	std::ofstream _ofs;
+
+private:
+
+	QString _fileName;
+	/// Timestamp for the output record
+	bool _printTimeStamp;
 };