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++/adxl345.cxx

@@ -22,30 +22,32 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#include <unistd.h>
+#include <stdio.h>
+
 #include "adxl345.hpp"
+#include "upm_utilities.h"
 
 int
-main(int argc, char **argv)
+main(int argc, char** argv)
 {
-//! [Interesting]
-    int16_t *raw;
-    float *acc;
+    //! [Interesting]
+    int16_t* raw;
+    float* acc;
 
     // Note: Sensor only works at 3.3V on the Intel Edison with Arduino breakout
-    upm::Adxl345* accel = new upm::Adxl345(0);
+    upm::Adxl345 accel(0);
 
-    while(true){
-        accel->update(); // Update the data
-        raw = accel->getRawValues(); // Read raw sensor data
-        acc = accel->getAcceleration(); // Read acceleration (g)
-        fprintf(stdout, "Current scale: 0x%2xg\n", accel->getScale());
+    while (true) {
+        accel.update();                // Update the data
+        raw = accel.getRawValues();    // Read raw sensor data
+        acc = accel.getAcceleration(); // Read acceleration (g)
+        fprintf(stdout, "Current scale: 0x%2xg\n", accel.getScale());
         fprintf(stdout, "Raw: %6d %6d %6d\n", raw[0], raw[1], raw[2]);
         fprintf(stdout, "AccX: %5.2f g\n", acc[0]);
         fprintf(stdout, "AccY: %5.2f g\n", acc[1]);
         fprintf(stdout, "AccZ: %5.2f g\n", acc[2]);
-        sleep(1);
+        upm_delay(1);
     }
-//! [Interesting]
+    //! [Interesting]
     return 0;
 }