[Feature] name tags for form fields

[superewald]

sumary

Add possibility to override form field's name tags in order to use forms for api hooks as discussed in #187.

changes

• added attribute "name" to form fields and render it in editor
• render value of "name" attribute (or auto-generated value by default) in frontend

This PR relies on #190 which is why it shows alot changes until #190 have been merged. You can just ignore all commits before the last two (3fd126b & 6028659).