api v2 (mimblewimble#2)

* APIv2 Rewrite first draft

Add WIP JSON RPC handler for APIOwner via proc-macro generated API, using the easy-jsonrpc crate.

* patch dependency on grin core to get serializable errors

* doctest ownerapi, update easyjsonrpc version

* begin impl ForeignApi

* mimblewimble/grin#2659 is merged, switch from using forked repo

* write jsonrpc doctests for ForeignApi

apiwallet/Cargo.toml

@@ -15,6 +15,7 @@ failure = "0.1"
 failure_derive = "0.1"
 log = "0.4"
 uuid = { version = "0.6", features = ["serde", "v4"] }
+easy-jsonrpc = "0.4.1"
 
 grin_libwallet = { path = "../libwallet", version = "1.1.0" }
 grin_wallet_config = { path = "../config", version = "1.1.0" }
@@ -25,3 +26,8 @@ grin_chain = { git = "https://github.com/mimblewimble/grin", branch = "milestone
 grin_util = { git = "https://github.com/mimblewimble/grin", branch = "milestone/1.1.0" }
 grin_api = { git = "https://github.com/mimblewimble/grin", branch = "milestone/1.1.0" }
 grin_store = { git = "https://github.com/mimblewimble/grin", branch = "milestone/1.1.0" }
+
+[dev-dependencies]
+grin_refwallet = { path = "../refwallet", version = "1.1.0" }
+serde_json = "1"
+tempfile = "3.0.7"