mv group directives to folder, add basic drag handle button

...eports/static/reports/app/directives/edit/addGroupMenu.js

...eports/static/reports/app/directives/edit/addItemsMenu.js

...ports/static/reports/app/directives/edit/itemContainer.js

.../web/reports/static/reports/app/directives/edit/layout.js

...eports/static/reports/app/directives/edit/panelContent.js

...ts/static/reports/app/directives/edit/panelExperiments.js

.../reports/static/reports/app/directives/edit/panelItems.js

...eb/reports/static/reports/app/directives/edit/plotItem.js

.../static/reports/app/directives/edit/tableFieldSelector.js

...b/reports/static/reports/app/directives/edit/tableItem.js

...eb/reports/static/reports/app/directives/edit/textItem.js

...orts/static/reports/app/directives/edit/viewSerialized.js

beat/web/reports/templates/reports/report.html