Add basic command-line interface

Command line interface to enable

• Set the log level
• Force clean data
• Force cached data

marked the checklist item Set the log level as completed

marked the checklist item Force clean data as completed

marked the checklist item Force cached data as completed

mentioned in commit c820de4b

mentioned in merge request !40 (merged)

closed via commit c820de4b

mentioned in commit b5f6274d

closed via merge request !40 (merged)

mentioned in commit f11ff984

unassigned @gregory.ashton