Kernel: Implement somewhat functioning multithread support

This still uses only a single cpu, but we can now have 'parallelization'

This seems to work fine in qemu and bochs, but my own computer did not
like this when I last tried.

I have absolutely no idea how multithreading should actually be
implmemented and I just thought and implemented the most simple one I
could think of. This might not be in any way correct :D

kernel/include/kernel/Scheduler.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <BAN/LinkedList.h>
+#include <kernel/Thread.h>
+
+namespace Kernel
+{
+
+	class Scheduler
+	{
+		BAN_NON_COPYABLE(Scheduler);
+		BAN_NON_MOVABLE(Scheduler);
+		
+	public:
+		static void Initialize();
+		static Scheduler& Get();
+
+		const Thread& CurrentThread() const;
+
+		void AddThread(void(*)());
+		void Switch();
+		void Start();
+
+		static constexpr size_t ms_between_switch = 4;
+
+	private:
+		Scheduler() {}
+
+	private:
+		BAN::LinkedList<Thread>				m_threads;
+		BAN::LinkedList<Thread>::iterator	m_current_iterator;
+	};
+
+}