Fix pat depends

[thet]

feat(core dom): Add method is_button.

dom.is_button tests, if an element is a button like element.
Button like elements are the following:

button,
button[type=button],
button[type=submit],
input[type=image],
input[type=button],
input[type=reset],
input[type=submit]

fix(pat-depends): Fix infinite loop situations.

Fix some situations where infinite loops were created of unnecessary
function calls were done:

• Do not en/disable already en/disabled inputs.
• Do not trigger and pat-depends element if the input is the element
  itself and not a contained sub-input.
• Do not trigger input events on button-like elements.