ui: Keyboard controls (#935)

* switch focus between views with Tab
* move focus within views with WASD/HJKL/Arrows
* move focus between graph edges by holding Shift
* move focus between code references by holding Shift
* removed graph panning with WASD and moved zooming to Alt + W/S
* removed graph navigation by pressing starting character in graph view lists
* changed local reference and custom trail shortcuts
* updated Keyboard Shortcuts window
* use common back and forward shortcuts and YZ & Shift + YZ
* fix macOS issue where widgets don't get proper focus after creating a new tab
* don't use shared_ptr in QtMainView

fixes #486, #327, #214, #210

src/lib_gui/qt/element/code/QtCodeFileTitleBar.cpp

@@ -2,6 +2,7 @@
 
 #include <QHBoxLayout>
 #include <QLabel>
+#include <QStyle>
 #include <QVariant>
 
 #include "Application.h"
@@ -189,6 +190,17 @@ void QtCodeFileTitleBar::updateRefCount(int refCount, bool hasErrors, size_t fat
 	}
 }
 
+bool QtCodeFileTitleBar::isCollapsed() const
+{
+	return m_expandButton->isVisible();
+}
+
+void QtCodeFileTitleBar::setIsFocused(bool focused)
+{
+	setProperty("focused", focused);
+	style()->polish(this);
+}
+
 void QtCodeFileTitleBar::setMinimized()
 {
 	m_expandButton->setVisible(true);