Add ui::table default constructor

libs/ui/include/psemek/ui/table.hpp

@@ -8,6 +8,8 @@ namespace psemek::ui
 	struct table
 		: grid_layout
 	{
+		table();
+
 		void reshape(geom::box<float, 2> const & box) override;
 
 		void set_size(std::size_t rows, std::size_t columns) override;

libs/ui/source/table.cpp

@@ -3,6 +3,11 @@
 namespace psemek::ui
 {
 
+	table::table()
+	{
+		set_size(0, 0);
+	}
+
 	void table::reshape(geom::box<float, 2> const & box)
 	{
 		grid_layout::reshape(box);