Fix Issue 5: allow deleting API outputs

See merge request extensions/dataprocessor!10

Added .first() in field & filter selectors so that it will always bring the first selector's values

See merge request extensions/dataprocessor!9

Removing Menu options after removing data source

See merge request extensions/dataprocessor!7

added lineItem data source

See merge request extensions/dataprocessor!6

Adds title names automatically on field/filter add (only on new). Implements #1

Closes #1

See merge request extensions/dataprocessor!8

Use fontawesome for icons instead of (deprecated) images that will be removed...

See merge request extensions/dataprocessor!4

code clean

Use fontawesome for icons instead of (deprecated) images that will be removed at some point. Resolves theming issue when using haystack theme

added campaign data source

See merge request !3

added participant search

See merge request !1