avm1: Fire `onReleaseOutside` event even when the button is invisible

ci: Temporarily disable Windows Node 14 test

Test is currently broken because of this issue:
actions/setup-node#411

chore: Update badges in `README.md`

* Improve build status and Discord badges.
* Add npm and AUR badges.

web: Add `refresh` method to `navigator.plugins`

chore: Bump approx to 0.5.1, remove clippy lint suppressions

desktop: Don't swallow Escape key (fix ruffle-rs#6135)

demo: Serve on default port

The switch to 8081 seems like a leftover from ruffle-rs#5250.
Return to the default 8080.

wgpu: Fix gradient shader on vulkan backend

A regression in naga caused a mistranslation of the gradient shader
on the vulkan backend. This caused radial gradients to be rendered
as linear gradients on the vulkan backend. dx12 seems unaffected.

This seems to be cased by a switch statement starting with a default
case Re-order the case statements to avoid this. Looks like it's been
fixed in naga master.

core: Remove unnecessary parameter from `post_instantiation`

`display_object` was always equivalent to `self`, there's no need to
pass both.

avm1: Fix function closures inside `with`

When creating a scope for a closure, any `with` scopes were being
filtered out, but this was incorrect; `with` scopes are still on
the scope chain when the function is called.