examples: Remove heap allocation from C++ examples

Cleanup of UPM C++ examples.  Switched from heap allocation to
stack allocation when possible.  This simplifies the samples since it
removes the need for explicit memory management.  A script was used to
identify and replace pointer use.  To simplify the replace script, I
re-formatted the C++ examples using the UPM .clang-format file.
Unfortuantely this changes the look of the UPM C++ examples to a large
degree.  However, examples will now have a standard look/feel and
uniform formatting.

    * Ran clang-format w/provided UPM .clang-format file
    * Removed new's/delete's whenever possible (left those in interface
      examples)
    * Added IIO sensor library implementation of callback void* arg
    * Converted all sleeps to upm defined delays (added header when
      necessary)
    * Scrubbed CXX example includes

Signed-off-by: Noel Eck <noel.eck@intel.com>

examples/c++/max5487.cxx

@@ -22,12 +22,12 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#include <unistd.h>
 #include <iostream>
-#include "max5487.hpp"
 #include <signal.h>
+#include <stdio.h>
 
-upm::MAX5487 *sensor = NULL;
+#include "max5487.hpp"
+#include "upm_utilities.h"
 
 void
 sig_handler(int signo)
@@ -39,28 +39,26 @@ sig_handler(int signo)
 }
 
 int
-main(int argc, char **argv)
+main(int argc, char** argv)
 {
     //! [Interesting]
-    sensor = new upm::MAX5487(7);
+    upm::MAX5487 sensor(7);
 
     // Power LED UP
     for (int i = 0; i < 255; i++) {
-        sensor->setWiperA(i);
-        usleep (5000);
+        sensor.setWiperA(i);
+        upm_delay_us(5000);
     }
 
     // Power LED DOWN
     for (int i = 0; i < 255; i++) {
-        sensor->setWiperA(255 - i);
-        usleep (5000);
+        sensor.setWiperA(255 - i);
+        upm_delay_us(5000);
     }
 
     //! [Interesting]
 
     std::cout << "exiting application" << std::endl;
 
-    delete sensor;
-
     return 0;
 }