State-reset and security mitigations.

Upgrade Ruma to present.

The following are intentionally benign for activation in a later commit:

- Hydra backports not default.
- Room version 12 not default.
- Room version 12 not listed as stable.

Do not enable them manually or you can brick your database.

Signed-off-by: Jason Volk <jason@zemos.net>

src/api/mod.rs

@@ -1,4 +1,4 @@
-#![type_length_limit = "65536"] //TODO: reduce me
+#![type_length_limit = "262144"] //TODO: REDUCE ME
 #![allow(clippy::toplevel_ref_arg)]
 
 pub mod client;