upm: add facility for exception handling in upm

We add a new src/upm_exception.i interface file for SWIG to catch
common exceptions and propagate them through SWIG.

src/upm.i is modified to include this interface file, so all UPM
drivers have it.

In theory, this should be language agnostic - if the target language
supports exceptions, then it should just work.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/upm.i

@@ -1,5 +1,6 @@
 %include "std_string.i"
 %include "stdint.i"
+%include "upm_exception.i"
 
 %typemap(out) mraa_result_t = int;