Initial backend test for user-based data/customizations (#4144)

Right now only support for colors and no real UX, idea is to test it & allow the idea to grow while figuring out the UX

src/Application.hpp

@@ -17,6 +17,8 @@ class AccountController;
 class NotificationController;
 class HighlightController;
 class HotkeyController;
+class IUserDataController;
+class UserDataController;
 
 class Theme;
 class WindowManager;
@@ -53,6 +55,7 @@ public:
     virtual TwitchIrcServer *getTwitch() = 0;
     virtual ChatterinoBadges *getChatterinoBadges() = 0;
     virtual FfzBadges *getFfzBadges() = 0;
+    virtual IUserDataController *getUserData() = 0;
 };
 
 class Application : public IApplication
@@ -89,6 +92,7 @@ public:
     ChatterinoBadges *const chatterinoBadges{};
     FfzBadges *const ffzBadges{};
     SeventvBadges *const seventvBadges{};
+    UserDataController *const userData{};
 
     /*[[deprecated]]*/ Logging *const logging{};
 
@@ -141,6 +145,7 @@ public:
     {
         return this->ffzBadges;
     }
+    IUserDataController *getUserData() override;
 
 private:
     void addSingleton(Singleton *singleton);