React to QeweEntry priority changes

[jgmcelwain]

Suggested behaviour:

const queue = new Qewe({ reactive: true });

const firstEntry = queue.enqueue('hello', 1);
const secondEntry = queue.enqueue('world', 2);

console.log(...queue); // [ 'world', 'hello' ]

firstEntry.priority = 3;

console.log(...queue); // [ 'hello', 'world ]

This should be possible by returning a Proxy from .enqueue that wraps the QeweEntry's priority setter.

[jgmcelwain]

Working on this over in #8