Remove ACF requirement

[HugoPoi]

Alternative message wysiwyg form and disable email checkbox depends of Advanced Custom Fields plugin.

Replace RegisterAcf.php with proper built-in code.

[jakubmikita]

Ha! I was heading to the Issues to ask you this question - why you used the ACF instead of own code? :)

I think this is the biggest downside of your plugin currently - another level of requirement. Once resolved I'll be more than happy to include it in the Notification extensions directory.

[HugoPoi]

I'm lazy for redoing existing stuff especially wordpress admin forms.