Split time lapse into intervalSnap and createTimelapse

[SydoxX]

Is your feature request related to a problem? Please describe.
Time lapse stops after video is created.

Describe the solution you'd like
Split the whole time lapse thingy into:

• intervalSnap
  Snaps a picture at given intervals.
• createTimelapse
  Creates a time lapse from all pictures in a given folder. Optionally deletes all used pictures.

Describe alternatives you've considered
None

Additional context
None