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

public/build/manifest.json

@@ -2,8 +2,8 @@
   "build/0.1a6ffb43.js": "build/0.1a6ffb43.js",
   "build/1.16767f92.js": "build/1.16767f92.js",
   "build/2.dad56560.js": "build/2.dad56560.js",
-  "build/app.css": "build/app.ce77694e.css",
-  "build/app.js": "build/app.23b99cbb.js",
+  "build/app.css": "build/app.483d7949.css",
+  "build/app.js": "build/app.055e71d1.js",
   "build/calendar.css": "build/calendar.ade7bcdf.css",
   "build/calendar.js": "build/calendar.9e7cdb6a.js",
   "build/chart.js": "build/chart.7f4d7f29.js",