* src/engine/api/geary-engine.vala (Engine): Move account_added and
account_removed signals to AccountRemoved since the engine isn't
tracking this any more. Remove bool param from add_account for the same
reason and update call sites.
* src/engine/api/geary-engine.vala (Engine): Require a ServiceInformation
object for IMAP and SMTP when creating orphan info objects. Update call
sites.
* src/client/accounts/account-manager.vala (AccountManager): provide
factory methods for constructing local service info objects. Use these
when re-constituting accounts. Use a singleton SecretMediator object
instance as a bonus.
* src/client/accounts/add-edit-page.vala (AddEditPage): Get
ServiceInformation objects from the account manager, pass an instance
of GearyApplication through so it has access to the manager. Update
call chains back to GearyController to pass the app instance through.
Instead of passing in user config and data base dirs to the Engine from
the app, then pulling them out from the engine again from the app, just
store them in AccountManager, since that's where they are needed.
* src/client/accounts/account-manager.vala (AccountManager): Store user
config and data base dirs directly rather than getting them from the
engine. Split account directory creation out into a separate method so
they aren't re-made every time the config is saved.
* src/engine/api/geary-engine.vala (Engine): Remove user config and data
dir properties and open_async args. Update call sites and unit tests.
* src/client/application/geary-controller.vala (GearyController): Chase
AccountManager and Engine API changes. Ensure account dirs are created
when an new account is added.
* src/engine/api/geary-account-information.vala (AccountInformation):
Explicitly track copies rather relying on account dirs being
null. Don't require dirs be set in the default ctor, since they won't
be known, provide a method for updating them later on instead.
* test/api/*.vala: Renamed files that contained mock objects to *-mock.vala,
not *-test.vala.
* test/testcase.vala: Renamed to test-case.vala for consistency, remove
TestCase class from Gee package since that's really not true. Clean up
code for consistency.
* test/meson.build, test/CMakeLists.txt: Split TestCase compilation out
into a separate test lib.
* src/engine/api/geary-engine.vala (Engine::create_orphan_account): Fix
sense of test when determining the next account id to use. Add unit
tests.
(Engine::add_account): Made public so it can be used in public test.
