Update state syncer to account for new features

Update state syncer (class DatabaseWidgetStateSync) to account for new
features:
- properly sync view state when switching tabs
- properly read/write view state from/to config

Update classes EntryModel and EntryView to consistenly name list/search
modes. Before, both classes defined list mode as 'group mode' and search
mode as 'entry list mode', which differed from naming in other classes
such as DatabaseWidget.

src/gui/DatabaseWidget.h

@@ -92,8 +92,23 @@ public:
     void setMainSplitterSizes(const QList<int>& sizes);
     QList<int> detailSplitterSizes() const;
     void setDetailSplitterSizes(const QList<int>& sizes);
-    QList<int> entryHeaderViewSizes() const;
-    void setEntryViewHeaderSizes(const QList<int>& sizes);
+
+    /**
+     * @author Fonic <https://github.com/fonic>
+     * Methods to get/set state of entry view 'Hide Usernames'/'Hide
+     * Passwords' settings
+     */
+    bool entryViewHideUsernames() const;
+    void setEntryViewHideUsernames(const bool hide);
+    bool entryViewHidePasswords() const;
+    void setEntryViewHidePasswords(const bool hide);
+    /**
+     * @author Fonic <https://github.com/fonic>
+     * Methods to get/set state of entry view view state
+     */
+    QByteArray entryViewViewState() const;
+    bool setEntryViewViewState(const QByteArray& state) const;
+
     void clearAllWidgets();
     bool currentEntryHasTitle();
     bool currentEntryHasUsername();
@@ -127,7 +142,13 @@ signals:
     void searchModeActivated();
     void mainSplitterSizesChanged();
     void detailSplitterSizesChanged();
-    void entryColumnSizesChanged();
+
+    /**
+     * @author Fonic <https://github.com/fonic>
+     * Signal to notify about state changes entry view view
+     */
+    void entryViewStateChanged();
+
     void updateSearch(QString text);
 
 public slots: