* Implement missing gamepad slots, align to spec more
- Fixes TODO's from initial gamepad implementation
- Adds some missing spec steps
* Only handle gamepad events when pref is enabled
* Return empty list in getGamepads if document not active
* ./mach fmt
* Update getGamepads to return an array instead of GamepadList
* Add spec link for [[exposed]] slot
* Remove failing test expectations for not-fully-active
* A few fixes
- Change should_notify to has_gesture
- Add spec links and TODO to navigator
- Remove unneeded clone from GamepadList::list
- Move gamepadconnected event firing into has_gesture block
* Use queue_with_canceller for tasks and add expects
* Explicitly check for gamepad user gesture
* Move user gesture check into separate function
* Change contains_user_gesture to be a gamepad function
* mach fmt
* Change axis/button threshold constants to be private to module
Extracted this out of #5649
This commit was created with the following commands:
```
find . -iname "*.webidl" -type f -print0 | xargs -0 sed -i '' 's/http:\(.*\)whatwg.org/https:\1whatwg.org/g'
```
```
find . -iname "*.rs" -type f -print0 | xargs -0 sed -i '' 's/http:\(.*\)whatwg.org/https:\1whatwg.org/g'
```
