3.5.0-rc.6

All the good stuff from:

• https://github.com/getkirby/kirby/releases/tag/3.5.0-rc.1
• https://github.com/getkirby/kirby/releases/tag/3.5.0-rc.2
• https://github.com/getkirby/kirby/releases/tag/3.5.0-rc.3
• https://github.com/getkirby/kirby/releases/tag/3.5.0-rc.4
• https://github.com/getkirby/kirby/releases/tag/3.5.0-rc.5

and …

Enhancements

• New sponsor button for Github
• Graceful fallback for Parsley when PHP's XML extension is missing
• Increasesd performance when a lot of files need to be published
• Updated translations

Fixes

• No longer misinterpret builder blocks as layouts #2966
• Fix access to textContent property on empty list #2979
• Fix Block::parse() method on empty input #2982