This adds support for thanking for log entries. It gets the log
ID from and attribute on the thank link (which does not yet have
this; that will come in T187485), and sets the source to be 'log'
if it's being called from Special:Log (this can be extended in
the future if we want to thank for log entries from elsewhere).
Bug: T186921
Change-Id: Ifdb458b873ed4f1e6e64760658d2293aba1e02b3
It was already being used when changing a "thank" link to a "thanked"
message because the user just clicked it and thanked that person, but
not when updating links on page load for things the user had already
thanked previously.
Bug: T190563
Change-Id: I4c5758ef446aa2712ae27a1c784555cbf23806f9
Many log entries are associated to (exactly one) revision,
and for these (only, and only where the log type is
whitelisted) we add a thank-link that behaves exactly
as the thank-link on diff and history pages.
Bug: T189752
Change-Id: I5f4e84c65d4fe2d95b20cdb3c3f9522ad3e5f422
