ems v3.42, mc4plus v3.36, mc2plus v3.26 (fatal error handler) (#32)

* ems v3.42, mc4plus v3.36, mc2plus v3.26

- built on 2021 jun 23
- main changes from previous release are:
  - enabled the fatal error handler to force a restart and send useful information to yarprobotinterface (see robotology/icub-firmware#191)

* updated versions

Author: marcoaccame