More autocompletes

• Added autocomplete for admin snippets
• Added autocomplete for admin components
• Added autocomplete for seoUrl, sw_include and sw_extends
• Added plugin generator

Vue Module generator, scheduled task generator

• Added vue module generator
• Added scheduled task generator
• Added feature flag autocomplete and goto handler

Refactor snippet implementation into Symfony plugin

• Removed custom navigation goto and implemented into Symfony plugin
• The Symfony plugin does not show anymore missing snippets

Fix changelog title

• Add changelog title escaping to dash

Frontend snippet autocompletion

• Moved generated files to file templates. Can be now edited in Settings
• Improved Vue component generation
• Added Changelog generation
• Added storefront snippet autocompletion

Added UUID live templates, fix conflict with another Shopware plugin

• Added UUID live template
• Fix conflict with Shopware 5 PhpStorm Plugin
• Added PHPUnit live templates