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++/groveemg.cxx

@@ -21,40 +21,41 @@
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
-#include <unistd.h>
 #include <iostream>
 #include <signal.h>
+
 #include "groveemg.hpp"
+#include "upm_utilities.h"
 
 using namespace std;
 
 int shouldRun = true;
 
-void sig_handler(int signo)
+void
+sig_handler(int signo)
 {
-  if (signo == SIGINT)
-    shouldRun = false;
+    if (signo == SIGINT)
+        shouldRun = false;
 }
 
-int main(int argc, char **argv)
+int
+main(int argc, char** argv)
 {
-  signal(SIGINT, sig_handler);
+    signal(SIGINT, sig_handler);
 
-//! [Interesting]
-  // The was tested with the GroveEMG Muscle Signal Reader Sensor Module
-  // Instantiate a GroveEMG on analog pin A0
-  upm::GroveEMG *emg = new upm::GroveEMG(0);
-  cout << "Calibrating...." << endl;
-  emg->calibrate();
-  
-  while (shouldRun)
-  {
-    cout << emg->value() << endl;
-    usleep(100000);
-  }
+    //! [Interesting]
+    // The was tested with the GroveEMG Muscle Signal Reader Sensor Module
+    // Instantiate a GroveEMG on analog pin A0
+    upm::GroveEMG emg(0);
+    cout << "Calibrating...." << endl;
+    emg.calibrate();
 
-//! [Interesting]
-  cout << "Exiting" << endl;
-  delete emg;
-  return 0;
+    while (shouldRun) {
+        cout << emg.value() << endl;
+        upm_delay_us(100000);
+    }
+
+    //! [Interesting]
+    cout << "Exiting" << endl;
+    return 0;
 }