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Due to often incomplete extensions which are transferred, we do not need
this validation.

* Show composer how to install
* Click to copy to clipboard

* Casts uploadComment to string before writing in DB

This is where users are going to click

Issue validation error when given composer name does not match
the one in latest version.

Remove composer name on import, when persisted composer name does not match
the one in uploaded version.

Simplify eID again, as we can now rely on composer_name in extension table
being correct.

At the same time remove the API to look for repository_clone_url
as this is not needed any more.

A checkbox lets users confirm they uploaded the extension
to Packagist and they own the package there.

Additionally, when this box is checked the composer name
needs to be provided as double confirmation.

If this composer name is valid, registered on Packagist
and matches the composer name of the latest uploaded
extension version, the composer name is persisted.

* Add AdditionalConfiguration.ddev.php
* Remove Solr configsets

Prune leading zeros from version number strings when generating the
download file name.

Fixes #353

Change detail box to grey instead of blue