We use ttkit for constructing the file, pretty much same approach could
be used for other formats as well, but I'm not sure what other would be
useful to support.

Fixes issue #210

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Bitbucket hook

https://github.com/nijel/weblate/pull/208#discussion-diff-3009481

Less code duplication and the _hook_helper functions returning an
HttpResponseBadRequest() is not handled by git_service_hook()
either way.

This reverts commit dc3e25a1.

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Apparently the documentation for writing brokers[1] is
wrong/outdated, and the documentation for managing the POST Service
broker is more up to date. So updated the code accordingly.

[1] https://confluence.atlassian.com/display/BITBUCKET/Writing+Brokers+for+Bitbucket
[2] https://confluence.atlassian.com/display/BITBUCKET/POST+Service+Management

Mostly (slightly) reworked code from github/bitbucket_hook().

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