Finished CPU instructions and created ui window.

include/interrupts.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <common.h>
+#include <cpu.h>
+
+typedef enum {
+    IT_VBLANK = 1,
+    IT_LCD_STAT = 2,
+    IT_TIMER = 4,
+    IT_SERIAL = 8,
+    IT_JOYPAD = 16
+} interrupt_type;
+
+void cpu_request_interrupt(interrupt_type t);
+
+void cpu_handle_interrupts(cpu_context *ctx);