added project start and end date (#1303)

* added sortable js library
* activity in invoice is optional
* added javascript widget for paginated boxes
* fix activity dropdown for globals only
* added timesheet service to reduce code duplication
* use repository to query for teams in dropdowns
* added project validator
* validate project start and end against timesheet
* include begin and end in dynamic form requests for projects
* added timezone and language option to import flag, improve timesheet import speed
* deactivate cross-timezone filter
* add virtual fields to field order list
* composer update
* added param to ignore dates
* position loader icon fixed - fixes #1330
* permission problem when creating a new project - fixes #1340
* remove dev dependencies webserver and thanks bundle
* stop information leak (begin and end date) in duration mode - fixes #1307
* unify timesheet edit dialog for user and admins
* fix security issue, own rates exposed to unauthorized users in multi-update dialog

README.md

@@ -21,7 +21,7 @@ It is built with modern technologies such as Symfony, Bootstrap, RESTful API, Do
 ### Requirements
 
 - PHP 7.2 or higher
-- Database (MySQL/MariaDB with timezone data, SQLite for development) 
+- Database (MySQL/MariaDB with timezone data, SQLite for development)
 - Webserver (nginx, Apache)
 - A modern browser
 - [Other libraries](https://www.kimai.org/download/)