Fix ESP32 compile bug, parallelize CI

This is a maintenance release. It fixes a compile failure on ESP32 systems, and adds ESP32 to the CI test matrix. No functional changes were made.

Add a compile-time version number

The Catena Arduino Platform needs to be able to display the library versions. So.. added a version, MCCIADK_VERSION, plus standard macros for creating and dissecting the version semantic-version style.

Prepare for Arduino library inclusion

This release fixes #16, so that this library can be included in the Arduino library list.

Bug fixes, small enhancements

v0.1.4 is a maintenance release. It adds McciAdkLib_SafeCopyString() (issue #8). Fixed a bug due to use of dot_a_linkage (issue #10). CI testing was extended to the MCCI STM32-based board support package (v2.0.0 or later).

Bug fix/continuous integration release

This release has no functional changes; it simply adds continuous integration support, fixes some compiler warnings, and aligns library.properties with MCCI general practice.