filter: Add ability to filter on user and org info
forms: Fix field lookup issue in DynamicForm::getField
filter: Add more context to selected field
filter: Allow specification of sorting for criteria

Allow developers to specify a sorting position for groups of fields
selectable in the criteria select drop-down
Merge pull request #836 from greezybacon/feature/user-org-data-filter

Add user and organization context to filters

Reviewed-By: Peter Rotich <peter@osticket.com>