modularized several services

README.md

config/user-config.js

config/user-config.sample.js

src/main.ts

src/modules/index.ts

src/modules/services/bulk-download-corsproxy-service.ts

src/modules/services/corsproxy-service.ts

src/modules/services/upload-service.ts

src/modules/services/vue-keycloak.ts

src/plugins/vuetify.js

tests/e2e/plugins/index.js

tests/e2e/support/index.js