ui: Added on-screen search feature (issue #79)

* Use menu action "Edit -> Find in View" or Ctrl + D
* UI displayed as search bar at bottom of main window
* Hide search bar with ECS or close button
* Entering a query searches in name of graph nodes and code contents of code view
* Use Enter to iterate through matches, well move match into view in graph and code view
* Checkboxes allow for adding/removing results for certain views
* Create Bookmark shortcut is now CTRL + S

bug id = 79

src/lib_gui/qt/element/QtScreenSearchBox.h

@@ -0,0 +1,84 @@
+#ifndef QT_SCREEN_SEARCH_BOX_H
+#define QT_SCREEN_SEARCH_BOX_H
+
+#include <QFrame>
+
+class ControllerProxy;
+class QCheckBox;
+class QHBoxLayout;
+class QLineEdit;
+class QPushButton;
+class QTimer;
+
+
+class QtFocusInFilter
+	: public QObject
+{
+	Q_OBJECT
+
+public:
+	QtFocusInFilter();
+
+signals:
+	void focusIn();
+
+protected:
+	bool eventFilter(QObject* obj, QEvent* event);
+};
+
+
+class QtScreenSearchBox
+	: public QFrame
+{
+	Q_OBJECT
+
+public:
+	QtScreenSearchBox(ControllerProxy* controllerProxy, QWidget* parent = nullptr);
+	virtual ~QtScreenSearchBox();
+
+	void refreshStyle();
+
+	void setMatchCount(size_t matchCount);
+	void setMatchIndex(size_t matchIndex);
+
+	void addResponder(const std::string& name);
+
+signals:
+	void closePressed();
+
+public slots:
+	void setFocus();
+
+private slots:
+	void searchQueryChanged();
+	void findMatches();
+	void returnPressed();
+
+	void previousPressed();
+	void nextPressed();
+
+private:
+	void activateMatch(bool next);
+
+	void updateMatchLabel();
+
+	ControllerProxy* m_controllerProxy;
+
+	QLineEdit* m_searchBox;
+	QPushButton* m_matchLabel;
+
+	QPushButton* m_searchButton;
+	QPushButton* m_prevButton;
+	QPushButton* m_nextButton;
+	QPushButton* m_closeButton;
+
+	QHBoxLayout* m_checkboxLayout;
+	std::vector<QCheckBox*> m_checkBoxes;
+
+	size_t m_matchCount = 0;
+	size_t m_matchIndex = 0;
+
+	QTimer* m_timer;
+};
+
+#endif // QT_SCREEN_SEARCH_BOX_H