Add a time expression provider for the client to select from the pred…#1

Merged

luqp merged 2 commits intomasterfrom feature/TimeExpressionProvider

Oct 31, 2019

+735-58

Commits on Oct 29, 2019

Add a time expression provider for the client to select from the predefined ones.
luqp
committed

Commits on Oct 31, 2019

Refactor code and add presicion test to time expressions
luqp
committed