Dropbox is updating their OAuth2 authentication to issue short-term
tokens, which are already supported by core\oauth2\client.
This commit updates the dropbox repository to use the
core\oauth2 API, which has built-in support for tokens and
offline access.
1. getMock()
2. setExpectedException()
3. checkForUnintentionallyCoveredCode renamed to beStrictAboutCoversAnnotation
4. beStrictAboutTestSize renamed to enforceTimeLimit
5. UnitTestCase class is now fully removed.
The SDK that this plugin was designed around is not compatible with recent
versions of Alfresco so the decisio has been made to move the repository to
the plugins database.