In the backend, allow:
* Adding dependencies on messages
* Marking gadgets as hidden so they don't show in preferences
These cannot be used by MediaWiki:Gadgets-definition gadgets, but will
be used by Gadgets 2.0 gadgets.
Change-Id: I55e97de9d631ae001ccc0164db172ba9c5689a34
GadgetRepo is an abstract class based off of the implementation in the
RL2 branch.
It is a singleton that provides basic methods to construct and interact
with Gadget objects.
The MediaWikiGadgetsDefinition class is an implementation of GadgetsRepo
that parses the "MediaWiki:Gadgets-definition" page for gadget
definitions.
Tests were left in place to demonstrate that no functional changes have
been made aside from relocation of code. Some tests should be moved to
separate files in the future.
Bug: T106176
Change-Id: I3e802889f6f495783f4dbac65c2a8cefa824a778
