Unsupported Protocol: Fix error message showing

gemtext: allow tabs as link delimiters

Top button: fix behavior by using modified urllib.parse

Commands: Add external open

http protocol: Make optional (depending if requests is installed)

browset: Set cursor position on page load

Gemtext: Format quotes in italics

protocols: Show errors instead of hanging or hiding them

protocol: add about uri scheme

gemini: make errors text/plain

toolbar: Make mobile-friendly

mimes: only fallback text/ to text mime

HighlightedCode: Handle everything that pygments can handle

protocols: Support http/https

browset: Support data protocol

Mimetypes: Handle source code syntax highlighting

mime: Support plaintext format as well

Bindings: Bind back and soon

soon button (forward): implement functionality

back button: implement functionality