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++/light.cxx

@@ -23,28 +23,27 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#include <unistd.h>
 #include <iostream>
+
 #include "light.hpp"
+#include "upm_utilities.h"
 
 int
-main(int argc, char **argv)
+main(int argc, char** argv)
 {
-//! [Interesting]
+    //! [Interesting]
     // Create the light sensor object using AIO pin 0
-    upm::Light* light = new upm::Light(0);
+    upm::Light light(0);
 
     // Read the input and print both the normalized ADC value and a
     // rough lux value, waiting one second between readings
-    while( 1 ) {
-        std::cout << light->name() << " normalized value is "
-                  << light->getNormalized() <<
-            ", which is roughly " << light->value() << " lux" << std::endl;
-        sleep(1);
+    while (1) {
+        std::cout << light.name() << " normalized value is " << light.getNormalized()
+                  << ", which is roughly " << light.value() << " lux" << std::endl;
+        upm_delay(1);
     }
 
     // Delete the light sensor object
-    delete light;
-//! [Interesting]
+    //! [Interesting]
     return 0;
 }