[MASSEMBLY-857] Support for custom resource filters

**[Nikolaus Zerdahelyi](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=ni2k@gmx.at)** opened **[MASSEMBLY-857](https://issues.apache.org/jira/browse/MASSEMBLY-857?redirect=false)** and commented

Custom resource filters are a very handy addition to maven resource filtering and there should be a way to use them in an assembly-plugin execution.
If there is already a way to use them when filtering resources in an assembly plugin execution, please add documentation.
Otherwise support for custom resource filters should be implemented.
See MRESOURCES-128.

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**Affects:** 3.0.0

Start by inspecting the Maven assembly-plugin execution path for resource filtering and compare its capabilities with MRESOURCES-128. Determine whether custom resource filters are already supported or need implementation; done means either documenting the existing configuration or providing working support for custom resource filters.

Written by the indexing model from the issue text.