Summary:
Ref T4420.
- Allow tokenizers to accept either a `Datasource` object (new style) or a URI (old style).
- Read URI and placeholder text from object, if available.
- Swap the "repositories" datasource (which seemed like the simplest one) over to the new stuff.
- Tweak/update the repo tokens a little bit.
Test Plan:
- Used tokenizer in Herald, Differential (search), Differential (edit), Push Logs.
- Grepped for other callsites.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T4420
Differential Revision: https://secure.phabricator.com/D9874
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