Plugins: Add isEnabled method

Plugins are now disabled at startup time unless there is some relevant configuration in hydra.conf. This avoids hydra-notify having to do a lot of redundant work (a lot of plugins did a lot of database queries before deciding they were disabled).

Note: BitBucketStatus users will need to add 'enable_bitbucket_status = 1' to hydra.conf.

Created by  Eelco Dolstra  on August 13, 2019
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