Vue.js find components

Adds global helper function for finding Vue components (window.vueFind = querySelector for VDOM)

Adds global helper function for finding Vue components

window.vueFind ~= querySelector for VDOM
window.vueFindAll ~= querySelectorAll for VDOM

window.vueFind('Card CardDialog[model=isCardDialogVisible]').model

- Simple selectors:
`window.vueFind('missing')` prints a warning with a tree of supported simple selectors

- Attribute selectors:
only `[attr=fullvalue]` and `[attr="full value"]` operators are supported

- Combinators:
simple selectors can only be combined with a descendant combinator (a space)