Deprecate and remove jQuery

[darkf]

jQuery is an unnecessary dependency with modern DOM APIs, and we can fully replace it. (We're also on an ancient, unsupported version of jQuery.)

The most annoying thing is .animate, but it's not hard to implement and can go in ui or such.

[darkf]

105 will make this a ton easier by obviating the need for jQuery in the UI. What's left is some minor jQuery utility functions which are trivially replaceable (e.g. by raw XHR requests or fetch, or Object.assign) or .animate (which is doable, we can use requestAnimationFrame or CSS3 animations.)

[darkf]

We also have a mock type stub for jQuery (called mockjq) which we can use to replace jQuery piecemeal and ensure it's no longer used.

[darkf]

In ui, it seems like they follow a few common patterns:

• Setting visibility, or show/hide
• Creating new elements (commonly <img>), which can/should be replaced with the new UI library (or native DOM APIs at least)
• Binding events (most of which can be done natively)
• Oddball stuff like .animate

So the grunt work is going to be the first three.

[darkf]

For .animate we can use CSS transitions (e.g. transition: top 1s ease;), which is easier and probably faster.

[darkf]

Okay, .animate was replaced (whoo!) with a CSS transition (slightly hacky, but that's browsers for you; it's still much better than jQuery.)

Some other things were replaced too (like scroll{Left,Top}, etc.)

Currently:

128

Which is not bad, just a lot of boring work.

[darkf]

Mouse wheel events should use the wheel / onwheel event (MDN).

[darkf]

XHR invocations are ported.

[darkf]

Woot, done! 9618bba

🎉 🎉 🎉