make labels read "link_aware" property from their widget defn

This adds a "link_aware" key to label definitions, and C++ tlabel
objects no longer initializer this to true, but instead read the
value from their definition configuration.

data/gui/default/widget/label_default.cfg

@@ -23,6 +23,8 @@
 		text_font_size = {FONT_SIZE}
 		text_font_style = {FONT_STYLE}
 
+		link_aware = true
+
 		[state_enabled]
 
 			[draw]

data/gui/schema.cfg

@@ -685,6 +685,11 @@
                         max="1"
                         super="generic/state"
                     [/tag]
+                    [key]
+                        name="link_aware"
+                        type="bool"
+                        default="false"
+                    [/key]
                 [/tag]
             [/tag]
             [tag]

src/gui/auxiliary/widget_definition/label.cpp

@@ -41,12 +41,21 @@ tlabel_definition::tlabel_definition(const config& cfg)
  * The reason is that labels are often used as visual indication of the state
  * of the widget it labels.
  *
+ * Note: The above is outdated, if "link_aware" is enabled then there is interaction.
+ *
+ *
  * The following states exist:
  * * state_enabled, the label is enabled.
  * * state_disabled, the label is disabled.
  * @begin{parent}{name="gui/"}
  * @begin{tag}{name="label_definition"}{min=0}{max=-1}{super="generic/widget_definition"}
  * @begin{tag}{name="resolution"}{min=0}{max=-1}{super="generic/widget_definition/resolution"}
+ * @begin{table}{config}
+ *     link_aware & bool & false & Whether the label is link aware. This means
+ *                                     it is rendered with links highlighted,
+ *                                     and responds to click events on those
+ *                                     links. $
+ * @end{table}
  * @begin{tag}{name="state_enabled"}{min=0}{max=1}{super="generic/state"}
  * @end{tag}{name="state_enabled"}
  * @begin{tag}{name="state_disabled"}{min=0}{max=1}{super="generic/state"}
@@ -57,6 +66,7 @@ tlabel_definition::tlabel_definition(const config& cfg)
  */
 tlabel_definition::tresolution::tresolution(const config& cfg)
 	: tresolution_definition_(cfg)
+	, link_aware(cfg["link_aware"].to_bool(false))
 {
 	// Note the order should be the same as the enum tstate is label.hpp.
 	state.push_back(tstate_definition(cfg.child("state_enabled")));

src/gui/auxiliary/widget_definition/label.hpp

@@ -28,6 +28,8 @@ struct tlabel_definition : public tcontrol_definition
 	struct tresolution : public tresolution_definition_
 	{
 		explicit tresolution(const config& cfg);
+
+		bool link_aware;
 	};
 };
 

src/gui/widgets/label.cpp

@@ -42,7 +42,7 @@ tlabel::tlabel()
 		, state_(ENABLED)
 		, can_wrap_(false)
 		, characters_per_line_(0)
-		, link_aware_(true)
+		, link_aware_(false)
 {
 	connect_signal<event::LEFT_BUTTON_CLICK>(boost::bind(&tlabel::signal_handler_left_button_click, this, _2, _3));
 	connect_signal<event::RIGHT_BUTTON_CLICK>(boost::bind(&tlabel::signal_handler_right_button_click, this, _2, _3));
@@ -115,6 +115,20 @@ const std::string& tlabel::get_control_type() const
 	return type;
 }
 
+void tlabel::load_config_extra()
+{
+	assert(config());
+
+	boost::intrusive_ptr<const tlabel_definition::tresolution>
+	conf = boost::dynamic_pointer_cast<const tlabel_definition::tresolution>(
+			config());
+
+	assert(conf);
+
+	set_link_aware(conf->link_aware);
+}
+
+
 void tlabel::signal_handler_left_button_click(const event::tevent /* event */, bool & handled)
 {
 	DBG_GUI_E << "label click" << std::endl;

src/gui/widgets/label.hpp

@@ -99,6 +99,10 @@ private:
 	/** See @ref tcontrol::get_control_type. */
 	virtual const std::string& get_control_type() const OVERRIDE;
 
+	/** Inherited from tcontrol. */
+	void load_config_extra();
+
+	/***** ***** ***** signal handlers ***** ****** *****/
 
 	/**
 	 * Left click signal handler: checks if we clicked on a hyperlink