reformat everything

using @girtsf clang-format prefs settings.  This should allow us to turn
on auto format in our editors without causing spurious file changes.

src/Periodic.h

@@ -1,22 +1,21 @@
 #pragma once
 
-#include <Arduino.h>
 #include "PeriodicTask.h"
+#include <Arduino.h>
 
 /**
  * Periodically invoke a callback.
- * 
+ *
  * This just provides C style callback conventions rather than a virtual function - FIXME, remove?
  */
 class Periodic : public PeriodicTask
 {
-  uint32_t (*callback)();
+    uint32_t (*callback)();
 
-public:
-  // callback returns the period for the next callback invocation (or 0 if we should no longer be called)
-  Periodic(uint32_t (*_callback)()) : callback(_callback) {}
+  public:
+    // callback returns the period for the next callback invocation (or 0 if we should no longer be called)
+    Periodic(uint32_t (*_callback)()) : callback(_callback) {}
 
-protected:
-
-  void doTask();
+  protected:
+    void doTask();
 };