ui: Updates for release

* updated color scheme highlight colors
* fixed highlight color resetting
* prevent project file being save with no changes
* fixed MessageListener crash due to alive flag being set too late
* new edit project icon

src/lib/settings/ProjectSettings.h

@@ -18,6 +18,7 @@ public:
 	~ProjectSettings();
 
 	bool operator==(const ProjectSettings& other) const;
+	bool operator!=(const ProjectSettings& other) const;
 
 	virtual void save(const FilePath& filePath);