Suggestion: Improvement: Add behaviour for adding content models

[RVanhuysseXenit]

Inclusion of custom content models could be improved by adding behaviour to the eu.xenit.amp-base plugin.
We could have the plugin scan the default location for content models (src/<srcSet>/amp/config/alfresco/module/<moduleName>/models) for custom model xml files and dynamically add those paths to the dictionaryModelBootstrap bean in the module-context.xml.
Additionally, a custom paths for models (model locations) could be supplied in the sourceSets.<srcSet>.amp.config closure.