cpp_headers: Renamed C++ headers from .h -> .hpp

To make room for UPM C and C++ sensor code to coexist, all UPM
C++ headers have been renamed from h -> hpp.  This commit contains
updates to documentation, includes, cmake collateral, examples, and
swig interface files.

    * Renamed all cxx/cpp header files which contain the string
    'copyright intel' from .h -> .hpp (if not already hpp).

    * Replaced all references to .h with .hpp in documentation,
    source files, cmake collateral, example code, and swig interface
    files.

    * Replaced cmake variable module_h with module_hpp.

    * Intentionally left upm.h since this file currently does not
    contain code (documentation only).

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

src/adxl345/jsupm_adxl345.i

@@ -4,7 +4,7 @@
 %include "../carrays_float.i"
 
 %{
-    #include "adxl345.h"
+    #include "adxl345.hpp"
 %}
 
 %typemap(out) int16_t * {
@@ -15,6 +15,6 @@
     $result = SWIG_NewPointerObj(SWIG_as_voidptr(result), SWIGTYPE_p_floatArray, 0 | 0 );
 }
 
-%include "adxl345.h"
+%include "adxl345.hpp"
 
 %include <carrays.i>