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/lib/Settings.cpp

@@ -0,0 +1,41 @@
+#include "Settings.h"
+
+#include "utility/FileSystem.h"
+#include "utility/logging/logging.h"
+#include "utility/text/TextAccess.h"
+
+Settings::Settings()
+{
+}
+
+Settings::~Settings()
+{
+}
+
+bool Settings::load(const std::string& filePath)
+{
+	m_config.reset();
+
+	if (FileSystem::exists(filePath))
+	{
+		m_config = ConfigManager::createAndLoad(TextAccess::createFromFile(filePath));
+		return true;
+	}
+	else
+	{
+		LOG_WARNING("File for Settings not found.");
+		return false;
+	}
+}
+
+void Settings::save(const std::string& filePath)
+{
+	if (m_config)
+	{
+		m_config->save();
+	}
+	else
+	{
+		LOG_WARNING("Settings were not saved.");
+	}
+}