fix(package): update vis-data to version 6.2.3 🚀 (visjs#244)

* chore(package): update vis-data to version 6.2.3

* chore(package): update lockfile package-lock.json

fix(data-set): do not use private props (visjs#232)

Formerly ._data was accessed directly. No idea how that could ever work
at all. Now the proper methods from the API are used so there should be
no further issues.

Closes visjs#228.

fix(data-types): change vadjust type to number because that is what i…

…t actually is (visjs#243)

Update jsdom to the latest version 🚀 (visjs#207)

* chore(package): update jsdom to version 15.2.1

* chore(package): update lockfile package-lock.json

feat(build): add index files to bundles (visjs#223)

This allows more visually appealing imports when used with bundlers:
```typescript
// Old, but still works:
import * as vis from "vis-network/standalone/esm/vis-network";

// New, achieving the same result (ESM):
import * as vis from "vis-network/standalone";

// ESM explicitly:
import * as vis from "vis-network/standalone/esm";

// UMD explicitly:
import * as vis from "vis-network/standalone/umd";
```

This partially works in HTML but the old way is preferred (less requests,
library name in dev tools and better compatibility):
```html
<!-- Old, still works. Recommended. -->
<script
  type="text/javascript"
  src="https://unpkg.com/vis-network/standalone/umd/vis-network.min.js"
></script>

<!-- New, works but has issues. Not recommended. -->
<script
  type="module"
  src="https://unpkg.com/vis-network/standalone/esm"
></script>

<!-- New, doesn't work. -->
<script
  type="text/javascript"
  src="https://unpkg.com/vis-network/standalone/umd"
></script>
```

fix(events): use the standard wheel event (visjs#208)

This event is now supported by all the browsers we care about. There's no need anymore to listen to the legacy events.

fix(build): various small issues (visjs#190)

- Persist all built files in CI.
- Ignore generated styles.
- Clean generated styles witn `npm run clean`.
- Update vis-dev-utils to fail the release if example screenshot
  generation fails.

feat(deps): update, pin and fix (visjs#184)

The dependencies got messed up (probably when I was merging
upstream/master into peer-build). This adds missing dependencies, pins
all the versions (Greenkeeper will inform us about outdated deps from
now on) and updates all the outdated ones.

feat(build): add standalone and peer builds (visjs#85)

* feat(build): add standalone and peer builds

* chore(dist): update

* style: reformat new files

* fix(build): update to core-js 3

Also ditches rollup-plugin-babel-minify in favor of directly configuring
babel plugin as the former doesn't work with core-js 3.

* fix(build): make it actually work without errors

* chore(dist): update

* chore(package): fix clean script

It missed all the new vis-network.* files. Now it deletes them.

* fix(build): use folder structure instead of big mess

* chore(types): remove useless d.ts file

I have no idea why I put it there, it's not imported from anywhere.

* fix(build): fix image copying and watch

* chore(examples): use standalone build

* chore(examples): add standalone/peer build examples

* fix(build): get rid of default import from util

Every UMD package overwrites the default and breaks everything. This
will work as long as no two packages use the same name for one of their
exports (seems to be the case right now).

* fix(build): don't reexport data and util from peer

DataSet, utils etc. can't be reexported because that would cause stack
overflow in UMD builds. They all export vis namespace therefore
reexporting leads to loading vis to load vis to load vis…

* chore(dist): update

* fix(build): update d.ts files for recent changes

* chore(examples): fix script and style paths

* style: reformat

* chore(examples): add code examples to basic usage

* chore(examples): add new builds examples to the index

* chore(examples): add legacy build example

* chore(examples): fix URL errors

* docs: update how to

* docs: fix typo

* fix(build): don't capitalize nonconstructor objects

* docs: update Gephi and DOT exports

* chore(dist): update

* chore(build): transpile dependencies

This ensures that all dependencies match our browser list.

* chore(dist): update

* chore(build): don't ignore declarations

* chore(dist): update

* chore(build): use concat instead of flatMap

This greatly increases compatibility as Array.prototype.flatMap is quite
new and only recently supported by Node.

* chore(build): add styles to files

* chore(scripts): clean all generated files

fix(manipulation): use interaction to handle drag (visjs#175)

Formelly manipulation system reimplemented dragging instead of using
interaction to handle it. This resulted to interaction options being
ignored during edge editing and adding. Forwarding the events to
interaction handler solves these issues.

Closes visjs#174.