Remove a bunch of compiler warnings

* Remove compile warnings
* Coding style fix

include/openspace/mission/mission.h

@@ -102,7 +102,7 @@ public:
     /**
      * Returns the associated link of this MissionPhase. If no link is associated, this
      * string will be empty.
-     * 
+     *
      * \return The associated link of the MissionPhase or the empty string
      */
     const std::string& link() const;
@@ -179,7 +179,7 @@ protected:
     std::string _link;
     /// Actions associated with the phase
     std::vector<std::string> _actions;
-    /// Important dates 
+    /// Important dates
     std::vector<Milestone> _milestones;
 };
 

include/openspace/rendering/framebufferrenderer.h

@@ -116,9 +116,10 @@ public:
     GLuint gBufferColorTexture() const;
 
     /**
-     * Gives access to the position texture of the G-buffer. NOTE: This texture is used for
-     * the majority of rendering the scene and might be already in use. Use CAUTION when
-     * using this function. The size of the texture is the resolution of the viewport.
+     * Gives access to the position texture of the G-buffer. NOTE: This texture is used
+     * for the majority of rendering the scene and might be already in use. Use CAUTION
+     * when using this function. The size of the texture is the resolution of the
+     * viewport.
      *
      * \return identifier of the position texture of the G-buffer
      */

include/openspace/util/json_helper.h

@@ -67,8 +67,8 @@ template <typename T>
 std::string formatJson(T value);
 
 /**
- * Sort a json object that is an array of objects with the structure 
- * [ key = {}, key = {} ...]. Sorts it by the provided key 
+ * Sort a json object that is an array of objects with the structure
+ * [ key = {}, key = {} ...]. Sorts it by the provided key
  *
  * \param json The json to sort
  * \param key The key the json should be sorted by

include/openspace/util/time.h

@@ -74,6 +74,8 @@ public:
     explicit Time(const std::string& time);
     Time(const Time& other) = default;
 
+    Time& operator=(const Time& other) = default;
+
     /**
      * Initializes the Time singleton.
      *