Replace composer scripts by a composer plugin

[ochorocho]

Activate the plugin so command are available prior composer install
https://getcomposer.org/doc/articles/plugins.md#plugin-modifies-downloads

[garvinhicking]

Bumping this, I'd like to try helping with this, if help is wanted.

(I'm checking this project out now by referral from Stefan Bürk and it looks very helpful, thank you!)

[ochorocho]

yw! :-)

IIRC, the entire problem is due to plugin install/activation process.
So, the plugin is only available on the second run.

See this PR: #35

Feel free to hit me up on typo3 slack.
Stefan and i were thinking about having this as a standalone CLI (just an idea).