Improve URL composition

We are missing an accessor to get a sao URL for the resource like __url__ but also we have multiple place where we need to compose an URL for a Tryton route.
So I think it will be good to have tools to harmonize this.

assigned to @ced

added trytond type::feature + 1 deleted label

added 1 deleted label and removed 1 deleted label

review264461005 updated at https://codereview.tryton.org/264461005/#ps286181002

review264461005 updated at https://codereview.tryton.org/264461005/#ps288391002

review264461005 updated at https://codereview.tryton.org/264461005/#ps286361002

New changeset 704a75e6416e by Cédric Krier in branch 'default':
Add __href__ and is_secure, host and http_host to url module
https://hg.tryton.org/modules/account_payment_stripe/rev/704a75e6416e

added 1 deleted label and removed 1 deleted label

closed

New changeset baa4dc8f7cb3 by Cédric Krier in branch 'default':
Add __href__ and is_secure, host and http_host to url module
https://hg.tryton.org/modules/marketing_automation/rev/baa4dc8f7cb3

New changeset 068a70e75ca7 by Cédric Krier in branch 'default':
Add __href__ and is_secure, host and http_host to url module
https://hg.tryton.org/modules/web_shortener/rev/068a70e75ca7

New changeset c4157134135a by Cédric Krier in branch 'default':
Add __href__ and is_secure, host and http_host to url module
https://hg.tryton.org/trytond/rev/c4157134135a

New changeset ff9b2aa11121 by Cédric Krier in branch 'default':
Add __href__ and is_secure, host and http_host to url module
https://hg.tryton.org/tryton-env/rev/ff9b2aa11121