hx-indicator attribute

• allows this syntax in hx-indicator11ms ‣

  this.server.respondWith('GET', '/test', 'Clicked!')
  var div = make('<div id="d1" hx-indicator="this"><button id="b1" hx-get="/test">Click Me!</button></div>')
  var btn = byId('b1')
  btn.click()
  btn.classList.contains('htmx-request').should.equal(false)
  div.classList.contains('htmx-request').should.equal(true)
  this.server.respond()
  btn.classList.contains('htmx-request').should.equal(false)
  div.classList.contains('htmx-request').should.equal(false)