Collection of small fixes and improvements

- Selections stay clearly visible when focus changes to other widget
- Autoresize columns
- Table properties view now correctly allows selection in both columns and draws selection correctly
- Tables can be sorted again and now by any column

pglab/widgets/CatalogTablesPage.h

@@ -16,6 +16,7 @@ class PgLabTableView;
 class PropertiesPage;
 class QTabWidget;
 class SqlCodePreview;
+class QSortFilterProxyModel;
 class TablesTableModel;
 class TriggerPage;
 
@@ -32,6 +33,7 @@ public:
 private:
 	PgLabTableView *m_tableView = nullptr;
 	TablesTableModel* m_tablesModel = nullptr;
+	QSortFilterProxyModel *m_tablesSortFilter = nullptr;
 
 	// Details
 	QTabWidget *m_detailsTabs = nullptr;