Move OC.theme to the bundle and deprecate oc_defaults (#15525)

apps/files/js/filelist.js

apps/oauth2/js/oauth2.js

apps/oauth2/js/oauth2.js.map

apps/oauth2/src/App.vue

apps/oauth2/src/main.js

core/js/dist/login.js

core/js/dist/login.js.map

core/js/dist/main.js

core/js/dist/main.js.map

core/js/js.js

core/js/setupchecks.js

core/js/tests/specHelper.js

core/src/OC/index.js

core/src/OC/theme.js

core/src/globals.js

lib/private/Template/JSConfigHelper.php

settings/js/admin.js