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++/hcsr04.cxx

@@ -22,12 +22,11 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#include <unistd.h>
 #include <iostream>
-#include "hcsr04.hpp"
 #include <signal.h>
-#include <stdlib.h>
-#include <sys/time.h>
+
+#include "hcsr04.hpp"
+#include "upm_utilities.h"
 
 int shouldRun = true;
 
@@ -41,22 +40,21 @@ sig_handler(int signo)
 
 //! [Interesting]
 int
-main(int argc, char **argv)
+main(int argc, char** argv)
 {
-    upm::HCSR04 *sonar = new upm::HCSR04(2, 4);
+    upm::HCSR04 sonar(2, 4);
     signal(SIGINT, sig_handler);
 
-    sleep(1);
+    upm_delay(1);
 
-    while(shouldRun){
+    while (shouldRun) {
         std::cout << "get distance" << std::endl;
-        double distance = sonar->getDistance(HCSR04_CM);
+        double distance = sonar.getDistance(HCSR04_CM);
         std::cout << "distance " << distance << std::endl;
-        sleep(2);
+        upm_delay(2);
     }
     std::cout << "Exiting... " << std::endl;
 
-    delete sonar;
     return 0;
 }
 //! [Interesting]