Enhanced jsonform version

[piorek94]

Please checkout new fork: https://github.com/piorek94/jsonform

The main goal of this fork:

• update bootstrap to 4.6.1
• merge all features of original repo and ulion fork
• update all dependencies (and add new optionals)

Changes:

• move towards new jsonschema drafts versions (draft-04) - not supported keywords: anyOf, oneOf, allOf
• support simple schema's
• support references (including recursive references)
• json schema validators: z-schema, ajv, jsv (deprecated)
• new WYSIWYG editor - summernote
• deleting i'th (tab)array item
• new color pickers - vanilla-picker & spectrum by seballot
• dropped transloadit (temporary)
• use fontawesome icons
• tagsinput partial support (not follow all the constraints)
• autocomplete (by jqueryUI & bootstrap-typeahead)
• arrays do not render first empty item from default