Task Labels

[racka98]

Is your feature request related to a problem? Please describe.
Would love to tag and label my Tasks so I can organize them more clearly.

Describe the solution you'd like
Provide labels for Tasks that can be color coded. They should serve as a means of sorting tasks and organizing things.
Preferably should also be an option for filtering the tasks by labels.
Labels should be stored on the device so they can be used by multiple Task without having to manually write them every time.

Describe alternatives you've considered
No other alternative at the moment.

[racka98]

First implementation of this feature has been merged on #82

Filtering system will be completed once issue #81 has been cleared.