Added new helper module for timelines.
Added new helper module for timelines.

This helps to determine wether a given event or period has begun/isactive/ended.

Patch by: Lennard de Rijk
Reviewed by: to-be-reviewed

MatthewWilkes/mw4068-packaging,MatthewWilkes/mw4068-packaging,MatthewWilkes/mw4068-packaging,MatthewWilkes/mw4068-packaging