[Feature] project config support project alias

[yeqown]

If I'm running command in folder named 'repo1-copy' but it's git repository name is 'repo1', I must specified the project name 'repo1' to find the correct project settings.

gitlab-flow  --project='repo1' feature release

now we can add 'project alias' in ONLY project level config.

gitlab-flow  --project='repo1' config edit/show