[META] base distribution phase 2

[oliverklee]

This meta ticket covers the base-distribution-related tasks for phase 2. The core-specific tasks are listed in phpList/core#125, the rest-api-specific tasks are listed in phpList/rest-api#20, and the web-frontend-specific-tasks are listed in phpList/web-frontend#16.

• make sure Composer installs the latest version of the dependencies (should be fixed as it was a Packagist configuration issue)
• [TASK] Remove the web-frontend depdendency #19 remove the web-frontend dependency
• Stable version required by composer but none available #16, [BUGFIX] Fix the instructions for composer create-project #20 make the package installable via composer create-project
• [TASK] Change the master branch alias to 4.0.x-dev (#26) #21 rename the branch alias from 4.0.0-dev to 4.0.x-dev https://getcomposer.org/doc/articles/aliases.md#branch-alias
• [FEATURE] Automatically create the document root #22, automatically set up the document root and document this
• Add documentation for regarding config file and web root #17, [FEATURE] Automatically create the document root #22 document the installation process
• add CI stuff for this package
• [FEATURE] Add the Symfony console #24 add the symfony console
• [TASK] Prevent web access to the application root #29 prevent access to the application root directory
• [TASK] Document the Apache configuration with examples #30 document the Apache settings (with examples)
• Add documentation explaining how to enable dev and test modes #25 document how to use the different application contexts
• [CLEANUP] Use core functions for creating bin/ and web/ #31 use the bin/ and web/ generation script from the core
• [TASK] Add var/ to the .gitignore #32 set up the log and cache directories
• Add documentation explaining how to enable dev and test modes #25, [TASK] Document running phpList in development and testing mode #33 document running phpList in development and testing mode
• [FEATURE] Clear the Symfony caches on a composer install/update #43 automatically clear and warm all caches on composer update
• [FEATURE] Have a parameters.yml outside of vendor/ #49 add a structure for a configuration file that is outside the vendor folder
• document how to create downloadable tgz/zip packages