Dump stack trace on crash (Implement #849) (#870)

* Print stack trace on crash

* Printing stack trace is fully functional except for WIN32

* Minor fixes

* Minor fixes

include/grabber/V4L2Wrapper.h

@@ -16,6 +16,7 @@ public:
 			VideoStandard videoStandard,
 			PixelFormat pixelFormat,
 			int pixelDecimation );
+	~V4L2Wrapper() override;
 
 	bool getSignalDetectionEnable();
 

include/grabber/X11Wrapper.h

@@ -26,6 +26,11 @@ public:
 	///
 	X11Wrapper(int cropLeft, int cropRight, int cropTop, int cropBottom, int pixelDecimation, const unsigned updateRate_Hz);
 
+	///
+	/// Destructor of this framebuffer frame grabber. Releases any claimed resources.
+	///
+	~X11Wrapper() override;
+
 public slots:
 	///
 	/// Performs a single frame grab and computes the led-colors

include/utils/DefaultSignalHandler.h

@@ -0,0 +1,6 @@
+#pragma once
+
+namespace DefaultSignalHandler
+{
+	void install();
+}