Started replacing dummy filter data with real one.

Added JSON generator class
Added dialog to add new FilterGroup

Designed a simply framework to automatically save/load data to
database, when adding/removing/changing filters (or other data in the
future)

NOTE: far from complete yet
Avoid scrolling when showing dialog
Fixed saving and restoring enums
Open browser automatically when running server
Added support for listing and deleting filters in filter groups
Filters are actually working now
Users can now update existing filters
Filter groups can be deleted now as well
When creating new filter group, select it as well