Kernel: Replace PIC with APIC

If APIC/IOAPIC is not found, we fallback to PIC

Interrupts don't seem to work on real hardware (?)

kernel/include/kernel/APIC.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <stdint.h>
+
+namespace APIC
+{
+
+	void Initialize();
+	void EOI();
+	void GetISR(uint32_t[8]);
+	void EnableIRQ(uint8_t irq);
+
+}

kernel/include/kernel/IDT.h

@@ -2,7 +2,7 @@
 
 #include <stdint.h>
 
-constexpr uint8_t IRQ_VECTOR_BASE = 0x50;
+constexpr uint8_t IRQ_VECTOR_BASE = 0x20;
 
 namespace IDT
 {

kernel/include/kernel/PIC.h

@@ -5,11 +5,12 @@
 namespace PIC
 {
 
-	void initialize();
-	void eoi(uint8_t);
-	void unmask(uint8_t);
-	void mask(uint8_t);
+	void Remap();
+	void MaskAll();
+	void EOI(uint8_t);
+	void Unmask(uint8_t);
+	void Mask(uint8_t);
 
-	uint16_t get_isr();
+	uint16_t GetISR();
 
 }