Add a method to detect the HAL runtime version (#228)

hal/lib/athena/HAL.cpp

@@ -164,6 +164,13 @@ const char* HAL_GetErrorMessage(int32_t code) {
   }
 }
 
+/**
+ * Returns the runtime type of this HAL
+ */
+HAL_RuntimeType HAL_GetRuntimeType() {
+  return HAL_Athena;
+}
+
 /**
  * Return the FPGA Version number.
  * For now, expect this to be competition year.