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++/ms5803.cxx

@@ -22,57 +22,50 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#include <unistd.h>
 #include <iostream>
 #include <signal.h>
 
 #include "ms5803.hpp"
+#include "upm_utilities.h"
 
 using namespace std;
 using namespace upm;
 
 int shouldRun = true;
 
-void sig_handler(int signo)
+void
+sig_handler(int signo)
 {
     if (signo == SIGINT)
         shouldRun = false;
 }
 
-
-int main(int argc, char **argv)
+int
+main(int argc, char** argv)
 {
     signal(SIGINT, sig_handler);
-//! [Interesting]
+    //! [Interesting]
 
     // Instantiate a MS5803 instance using i2c bus 0 and default address
-    upm::MS5803 *sensor = new upm::MS5803(0);
+    upm::MS5803 sensor(0);
 
     // For SPI, bus 0, you would pass -1 as the address, and a valid
     // pin for CS (or -1 if you are using a hw pin you have no control
     // over, like edison):
     // MS5803(0, -1, 9);
 
-    while (shouldRun)
-    {
+    while (shouldRun) {
         // update our values from the sensor
-        sensor->update();
+        sensor.update();
 
-        cout << "Temperature: "
-             << sensor->getTemperature()
-             << " C, "
-             << "Pressure: "
-             << sensor->getPressure()
-             << " mbar"
-             << endl;
+        cout << "Temperature: " << sensor.getTemperature() << " C, "
+             << "Pressure: " << sensor.getPressure() << " mbar" << endl;
 
-        sleep(1);
+        upm_delay(1);
     }
-//! [Interesting]
+    //! [Interesting]
 
     cout << "Exiting..." << endl;
 
-    delete sensor;
-
     return 0;
 }