test (unit/AP gateway): tests for XMPP reference/mention <=> AP mention conversion: this patch add 5 tests: - 2 to mention AP mention to XMPP conversion, with direct addressing or using "tag" field - 2 to test automatic mention parsing of body - 1 to test XEP-0372 Reference to AP mention conversion rel 369

You'll find install instructions in documentation (see doc/installation.rst).

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