1.7.1 FC

Mob 3820 legal notice placeholder (#247)

* refactor learn more button

* use KarhooExpandViewButton for "Learn more" button

* legal notice view added

* add tap recognizer and mailComposer

* fix paddings

* update translations

* update keys and provide test translations for legal notice

* remove bottom spacing for hidden text

* link parser and mail validator + mai validator tests

* Link Parser tests

* Add Legal notice Link opener

* update translations

* update text

* create KarhooMailMetaInfoComposer

* change variable name

* fixes

* pr fixes 2

* add discardableResult

* pr fixes 3

* change platform name

* remove reference to view controller from legal notice view

* document function

* replace view controller with base view controller in email composers

* update translations from Phrase.com

* fix texts

* move logic to presenter

* remove potential retain cycles

* add initial state for expand button. Init legal notice view in open state

* change legal notice to view controller

* add legal notice presenter

* update legal notice presenter