API BREAKING: Deprecated the function Schema::dropTables() and DbHelper::dropTables, for the new Db::dropTables()

[mattab]

This is a notice about a breaking API change for Plugins developers.

[mattab]

In ee0ed65: Fixes #4991 Deprecated the function Schema::dropTables() and DbHelper::dropTables.
Please use the new Db::dropTables() instead.
Next time we will give a bit more head-ups so you have more time to modify plugins. Thanks!