issue/2645 Added manifest creation and loading

[oliverfoster]

fixes #2645

PR goes into #2714 then into #2713 then into #2711 then into master

• Adapt is now JSON filename agnostic in the language folder (build.js and config.json are still fixed filenames outside of the language folders).
• Each file must contain an object or an array of objects with, at minimum a { "_type": "" }, { "_component": "" } or { "_model": "" } attribute on each JSON file object as this denotes the corresponding model inside the framework.
• Each language folder must have a { "_type": "course" } object.

Added

• grunt task language-data-manifests

Changed

• Reworked src/core/js/data.js to load manifest, files and become the collection for all models. It now has no references to the menu, page, article, block and component structure
• Moved menu, page, article, block and component controller parts from data into src/core/js/mpabc.js
• AdaptCollection so that it is no longer a data loader, only a container.

Deprecated

• Adapt.contentObjects, Adapt.articles, Adapt.blocks, Adapt.components in favour of Adapt.data

Testing

Tested with languagePicker, works as normal.
change events trigger from Adapt.data and Adapt.blocks, Adapt.components etc as intended

[cahirodoherty-learningpool]

👀

[tomgreenfield]

grunt build && grunt server

is now giving me

adapt.min.js:1 Uncaught ReferenceError: Logger is not defined