* Removes redundant .eslintrc from graph3d, lints the rest of the code base, and enables valid-jsdoc lint rule

* Corrects lint violations

Fix for #1222.

This makes the passed data of events `hoverNode`, `hoverEdge`, `blurNode` and `blurEdge`
more conformant to the passed data of the click events. In particular, the following
fields are added to the event data:

```
event: [Object] original hover event,
pointer: {
    DOM: {x:pointer_x, y:pointer_y},
    canvas: {x:canvas_x, y:canvas_y}
}
```

The changes can be tested with example `network/events/InteractionEvents`.

* Changed order of (de)select events for network

* Fixed parameters to _generateClickEvent() to be compatible with previous.

* replacing all ES6 imports with CJS require calls
resolves #2934
used the following regex to apply the changes in lib:
s/import\s+(\w+)\s+from\s+(.*);\s*$/var $1 = require($2).default;/
s/import\s+(\w+)\s+from\s+(.*)\s*$/var $1 = require($2).default;/

* cleaning up inconsistencies

* Added HTML tooltip support for Timeline

* Fixed tooltip position on Firefox

* Added Timeline tooltip example

* Updated tooltip location to be next to the mouse

* Added HTML element to example

* add pointer position to zoom event
* Update docs with zoom api

The selectEdge handler is now fired only if user clicked on an edge, in order to select it.
 It's not fired if the node are selected because there are connected to the selected node.