memory: Hide all copy/assignment ops for class w/heap allocation

Many of the UPM libraries allocate space on the heap but do not
explicitly handle copying and assignment.  This commit uses C++11 delete
to forbit both the copy and assignment operator for these classes.

The C++ examples which used assignment operators to initialize class
instances were also updated since it did not appear necessary in those
cases to use the assignment operator.

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/hdxxvxta/hdxxvxta.hpp

@@ -147,6 +147,10 @@ namespace upm {
     mraa::Aio *m_aioTemp;
 
   private:
+    /* Disable implicit copy and assignment operators */
+    HDXXVXTA(const HDXXVXTA&) = delete;
+    HDXXVXTA &operator=(const HDXXVXTA&) = delete;
+
     float m_aref;
     int m_aResTemp;
     int m_aResHum;