[FEATURE] Add domain model member
[FEATURE] Add member repository
[FEATURE] Add member controller
[FEATURE] Add templates for member model

Add list and show templates and properties partial.
[FEATURE] Add question model
[FEATURE] Add question repository
[FEATURE] Add question controller
[FEATURE] Add templates for question model

Add list and show templates and properties partial.
[FEATURE] Add member question model
[BUGFIX] Add missing tx_squad_role_member_mm table

Adds the missing create table statement to ext_tables.sql
[TASK] Rename section content -> main in Layout and Templates
[FEATURE] Add unit tests for controllers and models
[TASK] Update copyright notice in squad controller
[BUGFIX] Add missing controller actions to ext_locaclconf.php
[FEATURE] Add backend module