bno055: C port; C++ wraps C

The API has been changed in some cases - see the apichanges.md
document.

In addition, this driver uses a new upm_vectortypes.i SWIG interface
file to provide a mechanism for methods that return a vector of floats
and ints instead of a pointer to an array.

This works much nicer than C array pointers, and results in Python/JS/Java
code that looks much more "natural" to the language in use.

The Python, JS, and Java examples have been changed to use these
methods.  Support for the "old" C-style pointer methods are still
provided for backward compatibility with existing code.

As an example - to retrieve the x, y, and z data for Euler Angles from
the bno055, the original python code would look something like:

       ...
       x = sensorObj.new_floatp()
       y = sensorObj.new_floatp()
       z = sensorObj.new_floatp()
       ...
       sensor.getEulerAngles(x, y, z)
       ...
       print("Euler: Heading:", sensorObj.floatp_value(x), end=' ')
       print(" Roll:", sensorObj.floatp_value(y), end=' ')
       ...

Now the equivalent code is simply:

       floatData = sensor.getEulerAngles()
       print("Euler: Heading:", floatData[0], ...
       print(" Roll:", floatData[1], end=' ')
       ...

Additionally, interrupt handling for Java is now implemented
completely in the C++ header file now rather than the .cxx file, so no
special SWIG processing is required anymore. See Issue #518 .

Signed-off-by: Jon Trulson <jtrulson@ics.com>

src/bno055/CMakeLists.txt

@@ -1,5 +1,8 @@
-set (libname "bno055")
-set (libdescription "Intelligent 9-axis Absolute Orientation Sensor")
-set (module_src ${libname}.cxx)
-set (module_hpp ${libname}.hpp)
-upm_module_init(mraa)
+upm_mixed_module_init (NAME bno055
+    DESCRIPTION "Intelligent 9-axis Absolute Orientation Sensor"
+    C_HDR bno055.h bno055_regs.h
+    C_SRC bno055.c
+    CPP_HDR bno055.hpp
+    CPP_SRC bno055.cxx
+    CPP_WRAPS_C
+    REQUIRES mraa)