SVG images loaded as <img> elements must not execute scripts per spec.
Previously, SVGScriptElement::process_the_script_element() did not
check whether scripting was disabled, so script processing was
triggered via the children_changed() callback during XML parsing,
causing a nested event loop spin.
Fix this by:
- Disabling scripting on the SVG image's Page
- Passing XMLScriptingSupport::Disabled to the XML document builder
- Checking is_scripting_disabled() in SVGScriptElement before
processing any script element
- Logging a diagnostic when SVG XML parsing fails (previously the
parse result was silently discarded)
Previously, the `preload`, `preconnect` and `dns-prefetch` keywords
took precedence over the others. When these keywords were present
the default fetch processing steps would not occur even when a relevant
keyword such as `stylesheet` or `icon` was present.
Implemented by reusing AddMask display list item that was initially
added for `background-clip` property.
Progress on flashlight effect on https://null.com/games/athena-crisis
