ui: Refactored QtCodeSnippet and added view settings to ApplicationSettings

This change refactors parts of the QtCodeSnippet and places some settings into ApplicationSettings.
Additionally Application- and ProjectSettings were abstracted to the common base class Settings, which takes care of the
getting and setting values of the Configmanager member.

src/app/qt/view/QtCodeView.h

@@ -4,15 +4,11 @@
 #include <memory>
 #include <vector>
 
-#include <QFont>
-
 #include "component/view/CodeView.h"
 #include "qt/utility/QtThreadedFunctor.h"
 #include "utility/types.h"
 
 class QtCodeSnippet;
-class QtHighlighter;
-class QTextEdit;
 
 class QtCodeView: public CodeView
 {
@@ -31,17 +27,10 @@ public:
 	void activateToken(Id tokenId) const;
 
 private:
-	struct Snippet
-	{
-		std::shared_ptr<QtCodeSnippet> textField;
-		std::shared_ptr<QtHighlighter> highlighter;
-	};
-	std::vector<std::shared_ptr<Snippet>> m_snippets;
-
 	void doAddCodeSnippet(const std::string& str, const TokenLocationFile& locationFile, int startLineNumber);
 	void doClearCodeSnippets();
 
-	QFont m_font;
+	std::vector<std::shared_ptr<QtCodeSnippet> > m_snippets;
 
 	QtThreadedFunctor<void> m_clearCodeSnippetsFunctor;
 	QtThreadedFunctor<const std::string&, const TokenLocationFile&, int> m_addCodeSnippetFunctor;