Takeshi KOMIYA 0e98e9b1a8 Fix #6914: Emit a detailed warning when failed to resolve :ref: ...

To be clear the ambiguous warning for missing-reference :ref:,
this separates the warning to missing-label and missing-caption.

To emit a warning dynamically, this also adds a new event:
`warn-missing-reference` to customize warning messages via event
handlers.

2020-11-03 02:27:43 +09:00

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