move RumaResponse out of core Error; cleanup Error conversions.

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

src/api/mod.rs

@@ -9,7 +9,8 @@ extern crate conduit_service as service;
 pub(crate) use conduit::{debug_info, debug_warn, utils, Error, Result};
 pub(crate) use service::{pdu::PduEvent, services, user_is_local};
 
-pub(crate) use crate::router::{Ruma, RumaResponse};
+pub(crate) use self::router::Ruma;
+pub use self::router::RumaResponse;
 
 conduit::mod_ctor! {}
 conduit::mod_dtor! {}