Bash scripts: centralized all 'library' functions in a single file
All copyright forms updated to 2020.
fixed a common typo in many shell scripts and updated submodules
Bash scripts: introduced a new function to check dependencies.This function is used by several files to ensure that git, make, etc. are available.
updated all file headers to 2019
Major overhaul to AMiRo-OS version 2.0.0