Replaced .h C headers with c-prefixed version and added std:: prefix to C standard library usage (#90)

This was not done to stdint.h for brevity in type names. Also removed "using namespace std;".

wpilibc/athena/src/Preferences.cpp

@@ -7,12 +7,11 @@
 
 #include "Preferences.h"
 
+#include <algorithm>
+
 #include "HAL/HAL.h"
 #include "WPIErrors.h"
 
-#include <stdio.h>
-#include <algorithm>
-
 /** The Preferences table name */
 static const char* kTableName = "Preferences";
 
@@ -61,8 +60,8 @@ std::string Preferences::GetString(llvm::StringRef key,
 }
 
 /**
- * Returns the int at the given key.  If this table does not have a value
- * for that position, then the given defaultValue value will be returned.
+ * Returns the int at the given key.  If this table does not have a value for
+ * that position, then the given defaultValue value will be returned.
  *
  * @param key          the key
  * @param defaultValue the value to return if none exists in the table