Fix handling of transitionend events dispatched by nested elements
Properly handle events from nested elements
Change `emulateTransitionEnd` to `executeAfterTransition` &&
Looking around on js components I found out many checks, different expressed but with same purpose.
Some of them are trying to parse string to element, others, jQuery element to js simple nodeElement etc
With this Pr, I am trying to give a standard way to parse an element
So this pr:
* Creates `getElement` helper that tries to parse an argument to element or null
* Changes `isElement` to make explicit checks and return Boolean
* fixes tests deficiencies
* Force each plugin that extends base-components to implement a static method `NAME()`
* Remove redundant `NAME` argument from 'Utils.defineJQueryPlugin' & fix test
Moves more functionality to `base-component`, transferring the responsibility of disposal to parent class.
Each component, dusting disposal, sets its protected properties to `null`. So the same can be done in one place for all children components .
After some research, I found out that EventHandler saves all the custom events per element using namespace, and is capable of removing handlers using only the element and its namespace (`DATA_KEY`).
So, probably is better to utilize the base-component to do the same job.
