Add modules:remove command

[Amad3eu]

Closes #71

What it does

php artisan modules:remove {name} reverses what make:module sets up:

• Deletes the module directory
• Removes the module's package (read from its own composer.json name) from require / require-dev in the application composer.json
• Clears the module cache and reloads the registry
• Prints the composer update <package> command to run afterwards

It asks for confirmation before deleting anything (--force skips it; declining or running non-interactively without --force aborts with exit code 1). Unknown module names fail with exit code 1.

The app-modules/* path repository is left alone, since it's shared by every module.

Tests

Added ModulesRemoveTest (removal, other modules untouched, confirmation accepted/declined, unknown module). Full suite passes (136 tests).

Thanks @adam-dziuk for letting me pick this up.