Commit internal design refinement

[daniellanner]

With the latest changes #183 we should rethink the design of commits.

Notes

What we currently have designed as commit messages should be renamed as commit title. What we currently think of as commit messages should be done via commit notes. This ensures consistency on how to document files, commits, branches.

Edit

Furthermore we need a CLI method to edit these fields after submission. I propose a edit command which should be used to edit

• title
• notes
• tags
• user data

of commits, files, branches, tags.

For API design we can move the discussion to #90 .

[sebastianrath]

For clarification, the PR in the issue #183 was attached by mistake. I removed it and re-opened the issue