add in-game chat & update gui post-runnables timing & fix panel elements removal

src/graphics/ui/elements/Panel.cpp

@@ -62,6 +62,11 @@ void Panel::add(const std::shared_ptr<UINode> &node) {
     fullRefresh();
 }
 
+void Panel::remove(const std::shared_ptr<UINode> &node) {
+    Container::remove(node);
+    fullRefresh();
+}
+
 void Panel::refresh() {
     UINode::refresh();
     std::stable_sort(nodes.begin(), nodes.end(), [](auto a, auto b) {

src/graphics/ui/elements/Panel.hpp

@@ -25,6 +25,7 @@ namespace gui {
         Orientation getOrientation() const;
 
         virtual void add(const std::shared_ptr<UINode>& node) override;
+        virtual void remove(const std::shared_ptr<UINode>& node) override;
 
         virtual void refresh() override;
         virtual void fullRefresh() override;