did some restructuring, got multitasking almost working

kernel/scheduler.h

@@ -0,0 +1,13 @@
+#ifndef KSCHEDULER_H
+#define KSCHEDULER_H
+
+#include <stdint.h>
+
+void init_scheduler();
+
+int create_task(uint32_t entry_point, uint32_t cr3);
+
+void sleep(uint32_t ticks);
+void yield();
+
+#endif