Add support for redmine custom fields

[markusr]

It would be really nice to have custom fields

Link to api:
http://www.redmine.org/projects/redmine/wiki/Rest_CustomFields
http://www.redmine.org/projects/redmine/wiki/Rest_api#Working-with-custom-fields

Link to field types:
http://www.redmine.org/projects/redmine/wiki/RedmineCustomFields

A first implementation could be limited to some of ther "easier" types like: Text, Long Text, URL etc.

[indication]

Thank you for feature proposal.
The API version is 2.4. It is good practice to try implement.
How do we implement this... Using serializing objects? or Create type defined tables on the SQLite?

[ares]

This would be ultimate feature. In our redmine, we have custom fields for linking the pull request. It would be great if I could open it from openredmine.

For the question, if it has separate defined types table, it would even allow implementing searching on custom fields. So I'd vote for this.