Our composer packages are still listed under the vendor piwik on packagist. As there is no way to rename them, we need to create new packages and mark the old ones as abandoned

I've already started and will try to rename the other over the next days

• piwik/cache -> matomo/cache (Rename Piwik -> Matomo component-cache#17)
  -> released as version 2.0.0; usage needs to be implemented in Matomo 4
• piwik/decompress -> matomo/decompress (Rename Piwik -> Matomo component-decompress#12)
  -> released as version 2.0.0; usage needs to be implemented in Matomo 4
• piwik/device-detector -> matomo/device-detector
• piwik/ini -> matomo/ini (Rename Piwik -> Matomo component-ini#8)
  -> released as version 2.0.0; usage needs to be implemented in Matomo 4
• piwik/network -> matomo/network (Rebrand from Piwik to Matomo component-network#14)
• piwik/piwik -> matomo/matomo
  -> needs to be done in Matomo 4
• piwik/piwik-php-tracker -> matomo/matomo-php-tracker (Rebrand from Piwik to Matomo matomo-php-tracker#51)
• piwik/referrer-spam-blacklist -> matomo/referrer-spam-blacklist (Use renamed composer packages #12518)
• piwik/searchengine-and-social-list -> matomo/searchengine-and-social-list (Use renamed composer packages #12518)

Renaming the php packages does only make sense with Matomo 4, so we can rename all namespaces and classes without the possibility to break any plugins. Imho it doesn't make sense to name the package matomo/* but the classes would still need something like use Piwik\*