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++/grovespeaker.cxx

@@ -22,28 +22,27 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#include <unistd.h>
 #include <iostream>
-#include <signal.h>
+
 #include "grovespeaker.hpp"
 
 using namespace std;
 
-int main ()
+int
+main()
 {
-//! [Interesting]
-  // Instantiate a Grove Speaker on digital pin D2
-  upm::GroveSpeaker* speaker = new upm::GroveSpeaker(2);
+    //! [Interesting]
+    // Instantiate a Grove Speaker on digital pin D2
+    upm::GroveSpeaker speaker(2);
 
-  // Play all 7 of the lowest notes
-  speaker->playAll();
+    // Play all 7 of the lowest notes
+    speaker.playAll();
 
-  // Play a medium C-sharp
-  speaker->playSound('c', true, "med");
-//! [Interesting]
+    // Play a medium C-sharp
+    speaker.playSound('c', true, "med");
+    //! [Interesting]
 
-  cout << "Exiting" << endl;
+    cout << "Exiting" << endl;
 
-  delete speaker;
-  return 0;
+    return 0;
 }