Renames all our .hpp HAL files to .h (#44)

Adds consistency, as the HAL was .hpp however all other code was .h.

hal/include/HAL/Interrupts.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <stdint.h>
+
+#include <iostream>
+#include "errno.h"
+
+extern "C" {
+typedef void (*InterruptHandlerFunction)(uint32_t interruptAssertedMask,
+                                         void* param);
+
+void* initializeInterrupts(uint32_t interruptIndex, bool watcher,
+                           int32_t* status);
+void cleanInterrupts(void* interrupt_pointer, int32_t* status);
+
+uint32_t waitForInterrupt(void* interrupt_pointer, double timeout,
+                          bool ignorePrevious, int32_t* status);
+void enableInterrupts(void* interrupt_pointer, int32_t* status);
+void disableInterrupts(void* interrupt_pointer, int32_t* status);
+double readRisingTimestamp(void* interrupt_pointer, int32_t* status);
+double readFallingTimestamp(void* interrupt_pointer, int32_t* status);
+void requestInterrupts(void* interrupt_pointer, uint8_t routing_module,
+                       uint32_t routing_pin, bool routing_analog_trigger,
+                       int32_t* status);
+void attachInterruptHandler(void* interrupt_pointer,
+                            InterruptHandlerFunction handler, void* param,
+                            int32_t* status);
+void setInterruptUpSourceEdge(void* interrupt_pointer, bool risingEdge,
+                              bool fallingEdge, int32_t* status);
+}