Ported task.c and others from pokeruby

include/task.h

@@ -0,0 +1,29 @@
+#ifndef GUARD_TASK_H
+#define GUARD_TASK_H
+
+typedef void (*TaskFunc)(u8 taskId);
+
+struct Task
+{
+    TaskFunc func;
+    bool8 isActive;
+    u8 prev;
+    u8 next;
+    u8 priority;
+    s16 data[16];
+};
+
+extern struct Task gTasks[];
+
+void ResetTasks();
+u8 CreateTask(TaskFunc func, u8 priority);
+void DestroyTask(u8 taskId);
+void RunTasks();
+void TaskDummy(u8 taskId);
+void SetTaskFuncWithFollowupFunc(u8 taskId, TaskFunc func, TaskFunc followupFunc);
+void SwitchTaskToFollowupFunc(u8 taskId);
+bool8 FuncIsActiveTask(TaskFunc func);
+u8 FindTaskIdByFunc(TaskFunc func);
+u8 GetTaskCount();
+
+#endif // GUARD_TASK_H