Implement GPUSTAT and update IOPort design

src/Library/src/BootLoader/gpu_boot.cpp

@@ -1,5 +1,7 @@
+#include <PSX/GPU/GPU_Types.hpp>
+
 namespace GPU {
     void setup() {
-        
+
     }
 }

src/Library/src/BootLoader/spu_boot.cpp

@@ -1,5 +1,6 @@
 #include <PSX/System/IOPorts/SPU_IO.hpp>
 #include <PSX/System/IOPorts/DMA_IO.hpp>
+#include <limits.h>
 
 namespace SPU {
     using namespace Port;