logic: file associations for Mac and opening project files via Mac OS

* hide start screen when opening with project file
* added project icon file to bundle and file type association to plist
* listen for file open events from double click or drag and drop
* fixed crashes in window handling

src/lib_gui/qt/view/QtMainView.cpp

@@ -5,7 +5,8 @@
 #include "qt/window/QtMainWindow.h"
 
 QtMainView::QtMainView()
-	: m_setTitleFunctor(std::bind(&QtMainView::doSetTitle, this, std::placeholders::_1))
+	: m_hideStartScreenFunctor(std::bind(&QtMainView::doHideStartScreen, this))
+	, m_setTitleFunctor(std::bind(&QtMainView::doSetTitle, this, std::placeholders::_1))
 	, m_activateWindowFunctor(std::bind(&QtMainView::doActivateWindow, this))
 	, m_updateRecentProjectMenuFunctor(std::bind(&QtMainView::doUpdateRecentProjectMenu, this))
 	, m_showLicenseScreenFunctor(std::bind(&QtMainView::doShowLicenseScreen, this))
@@ -69,7 +70,7 @@ void QtMainView::setStatusBar(QStatusBar* statusbar)
 
 void QtMainView::hideStartScreen()
 {
-	m_window->clearWindows();
+	m_hideStartScreenFunctor();
 }
 
 void QtMainView::setTitle(const std::string& title)
@@ -97,6 +98,11 @@ void QtMainView::doUpdateRecentProjectMenu()
 	m_window->updateRecentProjectMenu();
 }
 
+void QtMainView::doHideStartScreen()
+{
+	m_window->clearWindows();
+}
+
 void QtMainView::doSetTitle(const std::string& title)
 {
 	m_window->setWindowTitle(QString::fromStdString(title));

src/lib_gui/qt/view/QtMainView.h

@@ -40,6 +40,7 @@ public:
 	virtual void showLicenseScreen();
 
 private:
+	void doHideStartScreen();
 	void doSetTitle(const std::string& title);
 	void doActivateWindow();
 	void doUpdateRecentProjectMenu();
@@ -48,6 +49,7 @@ private:
 	std::shared_ptr<QtMainWindow> m_window;
 	std::vector<View*> m_views;
 
+	QtThreadedFunctor<> m_hideStartScreenFunctor;
 	QtThreadedFunctor<const std::string&> m_setTitleFunctor;
 	QtThreadedFunctor<> m_activateWindowFunctor;
 	QtThreadedFunctor<> m_updateRecentProjectMenuFunctor;