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/apa102/apa102.hpp

@@ -156,6 +156,10 @@ class APA102
     void pushState();
 
   private:
+    /* Disable implicit copy and assignment operators */
+    APA102(const APA102&) = delete;
+    APA102 &operator=(const APA102&) = delete;
+
     mraa::Spi* m_spi;
     mraa::Gpio* m_csnPinCtx;