Add Composer autoloading functions and PHPStan for testing

vendor/symfony/console/Tests/Fixtures/application_mbstring.md

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+MbString åpplicätion
+====================
+
+* [`help`](#help)
+* [`list`](#list)
+
+**descriptor:**
+
+* [`descriptor:åèä`](#descriptoråèä)
+
+`help`
+------
+
+Displays help for a command
+
+### Usage
+
+* `help [--format FORMAT] [--raw] [--] [<command_name>]`
+
+The help command displays help for a given command:
+
+  php app/console help list
+
+You can also output the help in other formats by using the --format option:
+
+  php app/console help --format=xml list
+
+To display the list of available commands, please use the list command.
+
+### Arguments
+
+#### `command_name`
+
+The command name
+
+* Is required: no
+* Is array: no
+* Default: `'help'`
+
+### Options
+
+#### `--format`
+
+The output format (txt, xml, json, or md)
+
+* Accept value: yes
+* Is value required: yes
+* Is multiple: no
+* Default: `'txt'`
+
+#### `--raw`
+
+To output raw command help
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--help|-h`
+
+Display this help message
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--quiet|-q`
+
+Do not output any message
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--verbose|-v|-vv|-vvv`
+
+Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--version|-V`
+
+Display this application version
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--ansi`
+
+Force ANSI output
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--no-ansi`
+
+Disable ANSI output
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--no-interaction|-n`
+
+Do not ask any interactive question
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+`list`
+------
+
+Lists commands
+
+### Usage
+
+* `list [--raw] [--format FORMAT] [--] [<namespace>]`
+
+The list command lists all commands:
+
+  php app/console list
+
+You can also display the commands for a specific namespace:
+
+  php app/console list test
+
+You can also output the information in other formats by using the --format option:
+
+  php app/console list --format=xml
+
+It's also possible to get raw list of commands (useful for embedding command runner):
+
+  php app/console list --raw
+
+### Arguments
+
+#### `namespace`
+
+The namespace name
+
+* Is required: no
+* Is array: no
+* Default: `NULL`
+
+### Options
+
+#### `--raw`
+
+To output raw command list
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--format`
+
+The output format (txt, xml, json, or md)
+
+* Accept value: yes
+* Is value required: yes
+* Is multiple: no
+* Default: `'txt'`
+
+`descriptor:åèä`
+----------------
+
+command åèä description
+
+### Usage
+
+* `descriptor:åèä [-o|--option_åèä] [--] <argument_åèä>`
+* `descriptor:åèä -o|--option_name <argument_name>`
+* `descriptor:åèä <argument_name>`
+
+command åèä help
+
+### Arguments
+
+#### `argument_åèä`
+
+* Is required: yes
+* Is array: no
+* Default: `NULL`
+
+### Options
+
+#### `--option_åèä|-o`
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--help|-h`
+
+Display this help message
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--quiet|-q`
+
+Do not output any message
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--verbose|-v|-vv|-vvv`
+
+Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--version|-V`
+
+Display this application version
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--ansi`
+
+Force ANSI output
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--no-ansi`
+
+Disable ANSI output
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`
+
+#### `--no-interaction|-n`
+
+Do not ask any interactive question
+
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Default: `false`