Allow either submit or submit_and_watch on the builder. (#9)

* Refactor: allow submit and submit_and_watch, separate module builders

* Convert Balances, and use generic ModuleCalls

* Convert System, and use generic ModuleCalls

* Extract common calls to set_call

* rustfmt

* Test contract put_code with valid contract

* Patch jsonrpc client dependency for bugfix

* Handle result from call builder inside submit

* Use patched version of jsonrpc

* Lift module calls to Error

* jsonrpc 13.0

* Remove unused static constraints

src/codec.rs

@@ -4,6 +4,7 @@ use parity_scale_codec::{
     HasCompact,
 };
 
+#[derive(Clone)]
 pub struct Encoded(pub Vec<u8>);
 
 impl Encode for Encoded {