Add advanced search term parser

* Support quoted strings & per-field searching
* Support regex and exact matching
* Simplify search sequence
* Make search widget larger
* Add regex converter to Tools namespace

src/gui/entry/EntryView.h

@@ -43,9 +43,7 @@ public:
     int numberOfSelectedEntries();
     void setFirstEntryActive();
     bool isUsernamesHidden() const;
-    void setUsernamesHidden(bool hide);
     bool isPasswordsHidden() const;
-    void setPasswordsHidden(bool hide);
     QByteArray viewState() const;
     bool setViewState(const QByteArray& state);
 
@@ -57,6 +55,10 @@ signals:
     void entrySelectionChanged();
     void viewStateChanged();
 
+public slots:
+    void setUsernamesHidden(bool hide);
+    void setPasswordsHidden(bool hide);
+
 protected:
     void keyPressEvent(QKeyEvent* event) override;
     void focusInEvent(QFocusEvent* event) override;