Activation of sets per repository

[JanMikes]

User should be able to see list of sets and activate them one by one.

Activation of set should send PR to master branch and if accepted, then mark set as activated.

When user opens pull request to repository, his PR will be scanned by all activated sets.

@TomasVotruba i will please need list of sets possible to run which can be used and activated by user for his repository and maybe user readable name of set + features it offers, maybe examples, i do not know what things would user need to know about set 😄