- Change the object ownership semantics to take ownership of unique_ptr's rather than references

- Add helper functions for setting up config
- Add support for dynamically updating more config options (path related ones in particular)

src/imageselector.h

@@ -21,7 +21,7 @@ protected:
     ImageDetails populateImageDetails(const std::string&filename, const ImageDisplayOptions &baseOptions);
     bool imageValidForAspect(const ImageDetails& imageDetails);
     bool imageMatchesFilter(const ImageDetails& imageDetails);
-    std::unique_ptr<PathTraverser>& pathTraverser;
+    std::unique_ptr<PathTraverser> pathTraverser;
     bool debugMode = false;
 };