UI message parser

move message parser threads to UI set functions

src/UI/UI_textbox.hpp

@@ -7,9 +7,11 @@
 class UI_textbox : public UI_item
 {
 public:
-    UI_textbox(std::string id, std::string hint, Color fg_color, Color bg_color);
+    UI_textbox(std::string id, std::string hint, Color fg_color, Color bg_color, std::function<void(std::string, std::string)> on_change);
     UI_textbox(const json& j);
 
+    void set_text(std::string text) override;
+
     void set_hint(std::string hint);
     std::string hint() const;
 
@@ -17,4 +19,5 @@ public:
     json to_json() const override;
 private:
     std::string m_hint;
+    std::function<void(std::string, std::string)> m_on_change;
 };