Add support for merging WARs in the packager Maven plugin

I want to use the packager Maven plugin to write some functional tests for the WYSIWYG content editor. The editor packages its resources in a WAR so I need to be able to easily merge the WYSIWYG editor WAR with the platform web WAR.

The packager Maven plugin currently takes into account only the first dependency of type WAR. Besides that, it unzips the WAR in a folder named after the WAR artifact id (except for platform web and root webapp WARs which are handled separately).

I need 2 things:

• the packager plugin should take all WAR dependencies into account
• and it should support merging two or more WAR dependencies