Refactoring of Arduino folders. First implementation of Serial driver
for Arduino

Jira issue: WP-754
Merge pull request #470 from glatorre/WP-754

Refactoring of Arduino folders. First implementation of Serial driver for Arduino [WP-754]

mlasak: "what about the multiple files with same contents"

glatorre: "the serial_driver.ino file is currently the same for both the boards because the behavior is also the same. However I will enhance the mega version (rising a new jira issue) adding the capability to read sensors/actuators information from the SD card."