[#983] Update FFI Framework to 0.3.0 (#984)

Closes #983
Closes #914

Package.resolved

@@ -104,7 +104,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/zcash-hackworks/zcash-light-client-ffi",
       "state" : {
-        "revision" : "17804089d537f85e312132aa0bcf3654f4736fe9"
+        "revision" : "bf5992c2e53749ad11c1e85ad5d9c63e39bdf3cc",
+        "version" : "0.3.0"
       }
     }
   ],

Package.swift

@@ -16,7 +16,7 @@ let package = Package(
     dependencies: [
         .package(url: "https://github.com/grpc/grpc-swift.git", from: "1.14.0"),
         .package(url: "https://github.com/stephencelis/SQLite.swift.git", from: "0.14.1"),
-        .package(url: "https://github.com/zcash-hackworks/zcash-light-client-ffi", revision: "17804089d537f85e312132aa0bcf3654f4736fe9")
+        .package(url: "https://github.com/zcash-hackworks/zcash-light-client-ffi", from: "0.3.0")
     ],
     targets: [
         .target(