ui: reworked StartScreen and ProjectSettupScreen UI flow

* realigned buttons and elements
* fixed retina styles for mac
* removed MessageLoadSource and subsequent functionality
* edit existing project through menu
* browsing paths from the line item in QtDirectoryListBox
* grow QtDirectoryListBox instead of scroll
* take any file or directory as valid path
* fixed new project setup screen background
* fixed screen handling on cancelation

src/lib/settings/ProjectSettings.cpp

@@ -1,5 +1,22 @@
 #include "settings/ProjectSettings.h"
 
+std::vector<std::string> ProjectSettings::getDefaultHeaderExtensions()
+{
+	std::vector<std::string> defaultValues;
+	defaultValues.push_back(".h");
+	defaultValues.push_back(".hpp");
+	return defaultValues;
+}
+
+std::vector<std::string> ProjectSettings::getDefaultSourceExtensions()
+{
+	std::vector<std::string> defaultValues;
+	defaultValues.push_back(".cpp");
+	defaultValues.push_back(".cxx");
+	defaultValues.push_back(".cc");
+	return defaultValues;
+}
+
 std::shared_ptr<ProjectSettings> ProjectSettings::s_instance;
 
 std::shared_ptr<ProjectSettings> ProjectSettings::getInstance()
@@ -67,16 +84,12 @@ std::vector<std::string> ProjectSettings::getCompilerFlags() const
 
 std::vector<std::string> ProjectSettings::getHeaderExtensions() const
 {
-	std::vector<std::string> defaultValues;
-	defaultValues.push_back(".h");
-	return getValues("source/Extensions/HeaderExtensions", defaultValues);
+	return getValues("source/Extensions/HeaderExtensions", getDefaultHeaderExtensions());
 }
 
 std::vector<std::string> ProjectSettings::getSourceExtensions() const
 {
-	std::vector<std::string> defaultValues;
-	defaultValues.push_back(".cpp");
-	return getValues("source/Extensions/SourceExtensions", defaultValues);
+	return getValues("source/Extensions/SourceExtensions", getDefaultSourceExtensions());
 }
 
 bool ProjectSettings::setHeaderExtensions(const std::vector<std::string> &headerExtensions)

src/lib/settings/ProjectSettings.h

@@ -10,6 +10,9 @@ class ProjectSettings
 	: public Settings
 {
 public:
+	static std::vector<std::string> getDefaultHeaderExtensions();
+	static std::vector<std::string> getDefaultSourceExtensions();
+
 	static std::shared_ptr<ProjectSettings> getInstance();
 	~ProjectSettings();
 

src/lib/settings/Settings.cpp

@@ -57,16 +57,16 @@ void Settings::clear()
 	m_filePath = FilePath();
 }
 
-Settings::Settings()
-{
-	clear();
-}
-
 const FilePath& Settings::getFilePath() const
 {
 	return m_filePath;
 }
 
+Settings::Settings()
+{
+	clear();
+}
+
 void Settings::setFilePath(const FilePath& filePath)
 {
 	m_filePath = filePath;

src/lib/settings/Settings.h

@@ -18,10 +18,11 @@ public:
 	virtual void save(const FilePath& filePath);
 	void clear();
 
+	const FilePath& getFilePath() const;
+
 protected:
 	Settings();
 
-	const FilePath& getFilePath() const;
 	void setFilePath(const FilePath& filePath);
 
 	template<typename T>