Attach image to a dataset

...min-shared/components/data-path-form-control.component.ts

...p/admin/admin-shared/components/delete-btn.component.html

...n-shared/components/file-select-form-control.component.ts

client/src/app/admin/admin.module.ts

client/src/app/admin/admin.reducer.ts

.../app/admin/instance/components/instance-form.component.ts

.../app/admin/instance/containers/edit-instance.component.ts

...c/app/admin/instance/containers/new-instance.component.ts

...e/dataset/components/attribute/add-attribute.component.ts

...ce/dataset/components/dataset/dataset-form.component.html

...ance/dataset/components/dataset/dataset-form.component.ts

...rc/app/admin/instance/dataset/components/dataset/index.ts

...stance/dataset/components/image/image-form.component.html

...instance/dataset/components/image/image-form.component.ts

...tance/dataset/components/image/image-table.component.html

...nstance/dataset/components/image/image-table.component.ts

.../src/app/admin/instance/dataset/components/image/index.ts

client/src/app/admin/instance/dataset/components/index.ts

...n/instance/dataset/containers/attribute-list.component.ts

...n/instance/dataset/containers/edit-dataset.component.html