Changes HAL Port from a pointer to a handle (#93)

HAL Port is using a special handle, where the module and pin are bit
shifted straight into the handle. This is one of the few special cases
we have, but for the way port is used it is much cleaner and uses much
less memory.  Plus it is generic and not specific to one type.

hal/lib/athena/handles/HandlesInternal.cpp

@@ -11,6 +11,19 @@
 #include "UnlimitedHandleResource.h"
 
 namespace hal {
+HalPortHandle createPortHandle(uint8_t pin, uint8_t module) {
+  // set last 8 bits, then shift to first 8 bits
+  HalPortHandle handle = static_cast<HalPortHandle>(HalHandleEnum::Port);
+  handle = handle << 24;
+  // shift module and add to 3rd set of 8 bits
+  int32_t temp = module;
+  temp = (temp << 8) & 0xff00;
+  handle += temp;
+  // add pin to last 8 bits
+  handle += pin;
+  return handle;
+}
+
 HalHandle createHandle(int16_t index, HalHandleEnum handleType) {
   if (index < 0) return HAL_HANDLE_NEGATIVE_INDEX;
   uint8_t hType = static_cast<uint8_t>(handleType);