* Update database/tables to use SchemaSelector and add warning for protected schema
* Update database/triggers to use SchemaSelector and add warning for protected schema
* Update database/functions to use SchemaSelector and add warning for protected schema
* Update database/schemas to use SchemaSelector
* Small tweak to database/extensions page
* Update database/types to use SchemaSelector
* Add protected schemas warning for enumerated type and prevent edit/delete of types from protected schema
* Small style fix