Help with readability by using module.exports and require rather than the MobileFrontend
provided mw.mobileFrontend module manager (and avoid adopting webpack at this time)
Replace usages of mw.mobileFrontend.require with local require and module.exports
(compatible with RL or Node implementation)
Changes:
* Notifications modules are merged into skins.minerva.scripts and initialised
via a client side check.
* new file overlayManager for exporting an overlayManager singleton
rather than being hidden inside resources/skins.minerva.scripts/init.js
* All M.define/M.requires swapped out for require where possible
The `define` method is now forbidden in the repo.
Bug: T212944
Change-Id: I44790dd3fc6fe42bb502d79c39c4081c223bf2b1
Uncover a bug and fix it in the process \o/ - it seems that the
close icon is misplaced between clicking the notifications icon
and loading the contents of the overlay - this confuses the webdriver
as the button is not clickable.
Bug: T219920
Change-Id: Ib4d076fd9b7ea1cd48b6b58940a50560eacd51a0
jdlrobson