refactor: Move the builtin plugin specific init tasks to the plugin

main/gui/include/init/tasks.hpp

@@ -1,16 +1,10 @@
 #pragma once
 
-#include <functional>
-#include <string>
 #include <vector>
 
-namespace hex::init {
+#include <init/splash_window.hpp>
 
-    struct Task {
-        std::string name;
-        std::function<bool()> function;
-        bool async;
-    };
+namespace hex::init {
 
     /**
      * @brief Runs the exit tasks and print them to console