Scopes

• Installation
• Documentation
• Template (twig, xml)
• PHP sources
• Output HTML
• Output Markdown
• Appearance
• Other

Is your feature request related to a problem? Please describe.
Provide compatibility with phpDocumentor 3.

Describe the solution you'd like
Drop compatibility with phpDocumentor 2, which is intended for old PHP versions (<7.2). And provide configuration and documentation for new phpDocumentor 3 and recent PHP versions.