enc03r: C port; FTI; C++ wraps C

The API for this driver has changed.  See docs/apichanges.md.

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

docs/apichanges.md

@@ -4,9 +4,16 @@ API Changes                       {#apichanges}
 Here's a list of other API changes made to the library that break source/binary
 compatibility between releases:
 
+ * **enc03r** This driver no longer supports the value() function.  In
+ addition, an update() function has been added.  This function must be
+ called prior to calling angularVelocity().  angularVelocity() no
+ longer accepts an argument.  Additional functions have been added,
+ however they do not affect compatibility with previous versions.
+
  * **ds18b20** The C++ interface init() function has been deprecated.
  It is still present, but currently does nothing.  It will be removed
  in a future release.
+
  * **grove<name>** Starting with UPM 1.0 the Grove libraries have been renamed
  from *upm-grove<name>* to simply *upm-<name>*. Class names also match this new
  format, with old classes marked as deprecated throughout the documentation.
@@ -14,27 +21,35 @@ compatibility between releases:
  groveelectromagnet, groveemg, grovegprs, grovegsr, grovelinefinder, grovemd,
  grovemoisture, groveo2, grovescam, grovespeaker, groveultrasonic, grovevdiv,
  grovewater, grovewfs.
+
  * **grove** As of UPM 1.0 the Grove classes for sensors in the starter kit are
  being separated into individual libraries. The old classes will be deprecated
  over time and eventually removed. Corresponding libraries have the grove
  prefix removed. Affected classes are GroveButton, GroveLed, GroveLight,
  GroveRelay, GroveRotary, GroveSlide and GroveTemp.
+
  * The **ublox6** driver has been replaced with a generic implementation called
  nmea_gps as of UPM 1.0. This driver should handle all generic serial GPS
  devices that output NMEA data going forward.  This new driver has been tested
  with ublox6, DFRobot VK2828U7 (ublox7) and ublox LEA-6H GPS devices.
+
  * **grove** Binary compatibility was broken for the GroveTemp class as of UPM
  v0.7.3. C++ code using this class has to be recompiled.
+
  * There were frequent misspellings of the word *Celsius* in the UPM
  code.  In some cases, these were in method names, which will cause
  some API compatibility issues.  These have all been corrected for UPM
  versions after v.0.7.2.
+
  * Our **C++ header files** changed their extension from *.h* to *.hpp* in
  version 0.7.0, Intel provided examples and code samples also reflect this
  change but you will need to modify your `#include` directives in existing
  code.
+
  * **my9221**, **groveledbar** and **grovecircularled** are now all part of the
  same library (my9221) and new functionality was added going to v.0.5.1.
+
  * **stepmotor** driver API was changed significantly from v.0.4.1 to v.0.5.0.
+
  * **eboled** library was greatly improved in version 0.4.0 and the `draw()`
  function was removed in favor of a more complete GFX library implementation.