and merge eslint configs as far as possible.

CodeQL discovered some new warnings after the formatting regading unused
variables.
I confirmed that all of them could be either fixed or be dismissed and
applied the changes as part of this PR.

Fixes #29 
Fixes #130

fixes #190

[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change |
|---|---|
| minimatch | [`3.0.4` ->
`3.0.5`](https://renovatebot.com/diffs/npm/minimatch/3.0.4/3.0.5) |

### GitHub Vulnerability Alerts

#### [CVE-2022-3517](https://nvd.nist.gov/vuln/detail/CVE-2022-3517)

A vulnerability was found in the minimatch package. This flaw allows a
Regular Expression Denial of Service (ReDoS) when calling the
braceExpand function with specific arguments, resulting in a Denial of
Service.

---

### Configuration

📅 **Schedule**: Branch creation - "" (UTC), Automerge - At any time (no
schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, click
this checkbox.

---

This PR has been generated by [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://app.renovatebot.com/dashboard#github/xmldom/xmldom).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzMi4yNDEuNyIsInVwZGF0ZWRJblZlciI6IjMyLjI0MS43In0=-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* fix: Report errors if DOM is not well-formed

In case such a DOM would be created, the part that is not well formed will be transformed into text nodes, in which xml specific characters like `<` and `>` are encoded accordingly.

This change can break your code, if you relied on this behavior, e.g. multiple root elements in the past.
We consider it more important to align with the specs that we want to be aligned with,
considering the potential security issues that might derive from people not being aware of the difference in behavior.

Resolves GHSA-crh6-fp67-6883
https://dom.spec.whatwg.org/#concept-node-ensure-pre-insertion-validity

* fix: Prevent setting documentElement

if node is not inserted and add missing `Document.ownerDocument`.