Update Mojolicious to 8.0.

• Code name "Supervillain", this is a major release.
• Changed query method in Mojo::URL to merge with hash references and append with array references instead of the other way around. Because appended pairs should be able to preserve order.
• Changed template attribute in Mojolicious::Command to acivate vars by default.
• Removed test command.
• Removed deprecated expect_close attribute from Mojo::Content.
• Removed deprecated error and finish events from Mojo::IOLoop::Delay.
• Removed experimental status from server_timing method in Mojo::Headers.
• Removed experimental status from tag_to_html function in Mojo::DOM::HTML.
• Removed experimental status from tag method in Mojo::DOM::HTML.
• Removed experimental status from bytes_read and bytes_written methods in Mojo::IOLoop::Stream.
• Removed experimental status from before_server_start hook.
• Removed experimental status from timing->* helpers.
• Added clone method to Mojo::Promise.
• Added chmod method to Mojo::File.
• Added prepare event to Mojo::UserAgent.
• Added Mojolicious::Command::Author default namespace in Mojolicious::Commands.
• Moved Mojolicious::Command::cpanify to Mojolicious::Command::Author::cpanify.
• Moved Mojolicious::Command::generate to Mojolicious::Command::Author::generate.
• Moved Mojolicious::Command::generate::app to Mojolicious::Command::Author::generate::app.
• Moved Mojolicious::Command::generate::lite_app to Mojolicious::Command::Author::generate::lite_app.
• Moved Mojolicious::Command::generate::makefile to Mojolicious::Command::Author::generate::makefile.
• Moved Mojolicious::Command::generate::plugin to Mojolicious::Command::Author::generate::plugin.
• Moved Mojolicious::Command::inflate to Mojolicious::Command::Author::inflate.
• Updated project metadata.
• Improved Mojo::Promise to allow for reject and resolve methods to be used as class methods.
• Reduced memory usage of Mojo::IOLoop::Stream.
• Fixed a bug that prevented permessage-deflate WebSocket compression to work with newer versions of Chrome.