v8.0.0-alpha.1

• Added: bitbucket pipelines example by @james2doyle in #3979
• Fix php7.4 after 7.5.6 by @Kilbourne in #4001
• Update theme:dump with new non-interactive option by @carstenjaksch in #4004
• Make default_selector a fallback rather than an override (#3950) (#4009) by @florinr08 in #4010
• Added: encode responses in the file server by @james2doyle in #4014