Can be merged when database rows have been updated to
no longer use skin version.
* Drop migration code
* Drop skin version preference
* Drop default skin version and existing accounts skin version
* Move skin definitions into skin.json
* Repurpose SkinVector as an abstract class
* Update READMEs
Bug: T301930
Bug: T294995
Bug: T302627
Change-Id: I7454d8f1cfdef81e7f3df476d8ce86736b46fff2
A new vector-2022 skin is added. This will be the eventual home
of the new Vector skin when we are ready to migrate.
Please see SkinVector class for the migration plan to simulate this
as part of testing.
Bug: T291098
Change-Id: Ibaddf94a5bfb5e21bbbaf1e0aa1b343a3f566d2d
Remove using of User:getOption since this method
will be hard-deprecated. Now it is soft-deprecated.
Bug: T296083
Change-Id: I3194a9c1c5c70592f88bc4dbedc78846d1141768