Cleaner version, rename slug

[jdevalk]

I want to make the next version of this plugin, and resubmit it to the .org repository as comment-hacks.

1. Branch off a branch to use in step 7.
2. Remove all mentions of Yoast in PHP and CSS class names.
3. Remove all the deprecations.
4. Consider simpler auto-loader.
5. Change namespace to something simpler.
6. Build zip, submit to .org repository.
7. Create the [email protected] email alias

After approval of the plugin on .org:

1. Once approved, email PatchStack team to update the VDP (see link in the Security.md file).
2. Build a version of the original yoast-comment-hacks plugin that tries to update itself to the new comment-hacks version.

[aristath]

• Created a develop branch, to be used for the new plugin
• Branched off that in the cleanup branch
• Created PR Cleanup - prep for new plugin #117 which takes care of removing references to Yoast, and removing deprecations.

Once #117 gets merged to the develop branch, we can continue with the rest of the items on the list - I didn't want to include all changes in the same PR in order to better separate the tasks 👍

[aristath]

Autoloader tweaks in #118

[jdevalk]

Emailed the plugins team.