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++/si1132.cxx

@@ -22,20 +22,23 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#include <unistd.h>
 #include <iostream>
+
+#include "mraa/common.h"
 #include "si1132.hpp"
+#include "upm_utilities.h"
 
 #define FT4222_I2C_BUS 1
 
-int main ()
+int
+main()
 {
     //! [Interesting]
     upm::SI1132 lightSensor(mraa_get_sub_platform_id(FT4222_I2C_BUS));
     while (true) {
         float value = lightSensor.getVisibleLux();
         std::cout << "Light level = " << value << " lux" << std::endl;
-        sleep(1);
+        upm_delay(1);
     }
     //! [Interesting]
     return 0;