[MDEP-522] Support different output types for list, or resolve

**[Jochen Wiedmann](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=jochen@apache.org)** opened **[MDEP-522](https://issues.apache.org/jira/browse/MDEP-522?redirect=false)** and commented

Right now, the goals list, and resolve, generate a human readably output file. This is unsuitable for machine based processing, although a dependency list is very likely to be of use for downstream applications.

Suggestion: Introduce a new parameter outputFormat with values like "text" (current format, default), or "properties".

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**Affects:** 2.10

**Attachments:**
- [MDEP-522.patch](https://issues.apache.org/jira/secure/attachment/12795294/MDEP-522.patch) (_19.09 kB_)
- [MDEP-522.patch](https://issues.apache.org/jira/secure/attachment/12795293/MDEP-522.patch) (_18.45 kB_)

Start by reading the implementations of the list and resolve goals, then review the two attached MDEP-522.patch files for existing direction. The change should introduce an outputFormat option supporting the current text format by default and a properties format suitable for machine processing.

Written by the indexing model from the issue text.