GUI2: dropped some constructors marked deprecated

The common pattern is to pass the widget's builder to the ctor.

src/gui/widgets/pane.cpp

@@ -104,19 +104,6 @@ struct pane_implementation
 	}
 };
 
-pane::pane(const builder_grid_ptr item_builder)
-	: widget()
-	, items_()
-	, item_builder_(item_builder)
-	, item_id_generator_(0)
-	, placer_(placer_base::build(placer_base::grow_direction::vertical, 1))
-{
-	connect_signal<event::REQUEST_PLACEMENT>(
-			std::bind(
-					&pane::signal_handler_request_placement, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3),
-			event::dispatcher::back_pre_child);
-}
-
 pane::pane(const implementation::builder_pane& builder)
 	: widget(builder)
 	, items_()

src/gui/widgets/pane.hpp

@@ -52,9 +52,6 @@ public:
 
 	typedef std::function<bool(const item&)> filter_functor_t;
 
-	/** @deprecated Use the second overload. */
-	explicit pane(const builder_grid_ptr item_builder);
-
 private:
 	explicit pane(const implementation::builder_pane& builder);
 

src/gui/widgets/viewport.cpp

@@ -77,11 +77,6 @@ struct viewport_implementation
 	}
 };
 
-viewport::viewport(widget& widget) : widget_(widget), owns_widget_(false)
-{
-	widget_.set_parent(this);
-}
-
 viewport::viewport(const implementation::builder_viewport& builder,
 					 const builder_widget::replacements_map& replacements)
 	: widget(builder)

src/gui/widgets/viewport.hpp

@@ -33,10 +33,6 @@ class viewport : public widget
 {
 	friend struct viewport_implementation;
 
-public:
-	/** @deprecated use the second overload. */
-	explicit viewport(widget& widget);
-
 private:
 	viewport(const implementation::builder_viewport& builder,
 			  const builder_widget::replacements_map& replacements);