User edit support, small cleanup & bugfixs

src/api.js

src/components/Filters.vue

src/components/LoginForm.vue

src/components/ModelUpdate.vue

src/components/ModelUpload.vue

src/components/RegisterForm.vue

src/main.js

src/router/index.js

src/views/Account.vue

src/views/Admin.vue

src/views/ModelAdd.vue

src/views/ModelEdit.vue

src/views/UserEdit.vue