Download Command parameters are inconsistent and partially wrongly described

[UnseenWizzard]

Describe the bug
The download command in v1 as well as v2/'next' branch has inconsistent parameters (camel rather than snake case, non-fitting shorthand) and wrong copy pasted help texts.

Know issues that should be addressed:

• main.go: downloadSpecificAPI should be either renamed to download-specific-api to keep consistency or even better to specific-api as it's a part of download command
• main.go: p alias used for downloadSpecificApi > not really intuitiv
• main.go: help for download functionality tells Yaml file containing environment to deploy to - deploy should be renamed to download