Reordered headers according to the style guide (#58)

Subsections are alphabetized according to lexographic ordering. Also, HAL includes were moved from headers to source files where possible. This change may cause user code which uses HAL functionality and does not include the relevant HAL header (since it may have been provided by another WPILib header) to fail to compile.

hal/lib/athena/HALAthena.cpp

@@ -8,12 +8,14 @@
 #include "HAL/HAL.h"
 
 #include <signal.h>  // linux for kill
+#include <stdlib.h>
 #include <sys/prctl.h>
 #include <unistd.h>
-#include <cstdlib>
+
 #include <fstream>
 #include <iostream>
 #include <mutex>
+
 #include "ChipObject.h"
 #include "FRC_NetworkCommunication/CANSessionMux.h"
 #include "FRC_NetworkCommunication/FRCComm.h"
@@ -23,6 +25,7 @@
 #include "HAL/Port.h"
 #include "ctre/ctre.h"
 #include "visa/visa.h"
+
 const uint32_t solenoid_kNumDO7_0Elements = 8;
 const uint32_t dio_kNumSystems = tDIO::kNumSystems;
 const uint32_t interrupt_kNumSystems = tInterrupt::kNumSystems;