Added more tests and bug fixes

src/app/core/json-patch/json-patch-operations.reducer.ts

src/app/shared/date.util.ts

src/app/shared/form/builder/form-builder.service.ts

src/app/submission/form/submission-form.component.ts

src/app/submission/objects/submission-objects.actions.ts

src/app/submission/objects/submission-objects.effects.ts

...app/submission/objects/submission-objects.reducer.spec.ts

src/app/submission/objects/submission-objects.reducer.ts

src/app/submission/sections/form/section-form.component.ts

src/app/submission/sections/sections.directive.ts

src/app/submission/sections/sections.service.ts

src/app/submission/sections/upload/file/file.component.ts

...pp/submission/sections/upload/section-upload.component.ts