EZP-23147: As a developer, I want to be able to write plugins for the apps
EZP-23147: Moved the Handlebars partial registration to an app plugin
EZP-23147: Moved the Handlebars helper registration to an app plugin
EZP-23147: Moved the DOM state handling to a dedicated app plugin
Merge pull request #100 from ezsystems/ezp-23147_plugin_app

EZP-23147: As a developer, I want to be able to write plugins for the apps