api!: remove all oauth support and drop DC_LP_AUTH flags

BREAKING CHANGE: removed oauth2 module, dc_get_oauth2_url FFI function, DC_LP_AUTH flags and configured/serverflags, and the oauth2 parameter/field from SMTP/IMAP clients, JSON-RPC interfaces, and CLI tools.

also contains regenerated provider data after dropping oauth in the update script.

src/lib.rs

@@ -76,7 +76,6 @@ pub mod login_param;
 pub mod message;
 mod mimefactory;
 pub mod mimeparser;
-pub mod oauth2;
 mod param;
 #[cfg(not(feature = "internals"))]
 mod pgp;