Introduce option groups#552

Merged

moh-hassan merged 14 commits into

commandlineparser:developfrom

hadzhiyski:feature/group-options

Dec 18, 2019

Commits on Dec 13, 2019

Delete unused GroupAttribute
hadzhiyski
committed

Commits on Dec 15, 2019

Commits on Dec 17, 2019

Modify type of Group to string instead of `Mayb<string>'
moh-hassan
committed