Add url for mobile contact mechanisms

As mobile is a subset of phone I think it makes sense to allow to call them by url.

assigned to @pokoli

added party type::feature + 1 deleted label

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review267751002 updated at https://codereview.tryton.org/267751002/#ps279811002

review267751002 updated at https://codereview.tryton.org/267751002/#ps279831002

New changeset c25ac770614e by Sergi Almacellas Abellana in branch 'default':
Add call url for mobile contact mechanisms
https://hg.tryton.org/modules/party/rev/c25ac770614e

added 1 deleted label and removed 1 deleted label

closed

New changeset bf4556879e18 by Sergi Almacellas Abellana in branch 'default':
Add call url for mobile contact mechanisms
https://hg.tryton.org/tryton-env/rev/bf4556879e18