Add changelog detail and edit components, separate create and update methode in services

.gitignore

src/app/app.component.ts

src/app/app.routing.module.ts

...mponents/changelog/detail/changelog-detail.component.html

...mponents/changelog/detail/changelog-detail.component.scss

...components/changelog/detail/changelog-detail.component.ts

...p/components/changelog/edit/changelog-form.component.html

...p/components/changelog/edit/changelog-form.component.scss

...app/components/changelog/edit/changelog-form.component.ts

src/app/components/changelog/list/changelog.component.html

src/app/components/changelog/list/changelog.component.ts

src/app/components/formats/edit/format-form.component.ts

src/app/components/formats/list/formats.component.ts

src/app/components/index.ts

...ponents/organizations/edit/organization-form.component.ts

.../components/organizations/list/organizations.component.ts

src/app/components/resources/edit/resource-form.component.ts

src/app/components/resources/list/resources.component.ts

src/app/models/changelog.model.ts

src/app/services/changelog.service.ts