Enumeratable accounts (#195)

* Merge remote-tracking branch 'origin/master' into gav-xts-dont-panic

* Update wasm.

* consensus, session and staking all panic-safe.

* Democracy doesn't panic in apply.

* Fix tests.

* Extra helper macro, council depanicked.

* Fix one test.

* Fix up all council tests. No panics!

* Council voting depanicked.

* Dispatch returns result.

* session & staking tests updated

* Fix democracy tests.

* Fix council tests.

* Fix up polkadot parachains in runtime

* Fix borked merge

* More Slicable support

Support general `Option` and array types.

* Basic storage types.

* Existential deposit for contract creation

* Basic implemnetation along with removals

* Fix tests.

* externalities builder fix.

* Tests.

* Fix up the runtime.

* Fix tests.

* Add generic `Address` type.

* Initial function integration of Address into Extrinsic.

* Fix build

* All tests compile.

* Fix (some) tests.

* Fix signing.

* Push error.

* transfer can accept Address

* Make Address generic over AccountIndex

* Fix test

* Make Council use Address for dispatch.

* Fix build

* Bend over backwards to support braindead derive.

* Repot some files.

* Fix tests.

* Fix grumbles

* Remove Default bound

* Fix build for new nightly.

* Make `apply_extrinsic` never panic, return useful Result.

* More merge hell

* Doesn't build, but might do soon

* Serde woes

* get substrate-runtime-staking compiling

* Polkadot builds again!

* Fix all build.

* Fix tests & binaries.

* Reserve some extra initial byte values of address for future format changes

* Make semantic of `ReservedBalance` clear.

* Fix panic handler.

* Integrate other balance transformations into the new model

Fix up staking tests.

* Fix runtime tests.

* Fix panic build.

* Tests for demonstrating interaction between balance types.

* Repot some runtime code

* Fix checkedblock in non-std builds

* Get rid of `DoLookup` phantom.

* Attempt to make transaction_pool work with lookups.

* Remove vscode settings

* New attempt at making transaction pool work.

* It builds again!

* --all builds

* Fix tests.

* New build.

* Test account nonce reset.

* polkadot transaction pool tests/framework.

* Address grumbles.

* Revert bad `map_or`

* Rebuild binaries, workaround.

* Avoid casting to usize early.

* reenable sync tests

substrate/substrate/executor/wasm/Cargo.lock

@@ -1,3 +1,11 @@
+[[package]]
+name = "arrayvec"
+version = "0.4.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "byteorder"
 version = "1.2.1"
@@ -13,6 +21,11 @@ name = "fixed-hash"
 version = "0.1.3"
 source = "git+https://github.com/rphmeier/primitives.git?branch=compile-for-wasm#8dc457899afdaf968ff7f16140b03d1e37b01d71"
 
+[[package]]
+name = "nodrop"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "pwasm-alloc"
 version = "0.1.0"
@@ -67,6 +80,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "substrate-codec"
 version = "0.1.0"
+dependencies = [
+ "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "substrate-primitives"
@@ -122,9 +138,11 @@ dependencies = [
 ]
 
 [metadata]
+"checksum arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)" = "a1e964f9e24d588183fcb43503abda40d288c8657dfc27311516ce2f05675aef"
 "checksum byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "652805b7e73fada9d85e9a6682a4abd490cb52d96aeecc12e33a0de34dfd0d23"
 "checksum crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "a2f4a431c5c9f662e1200b7c7f02c34e91361150e382089a8f2dec3ba680cbda"
 "checksum fixed-hash 0.1.3 (git+https://github.com/rphmeier/primitives.git?branch=compile-for-wasm)" = "<none>"
+"checksum nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "9a2228dca57108069a5262f2ed8bd2e82496d2e074a06d1ccc7ce1687b6ae0a2"
 "checksum rustc-hex 2.0.0 (git+https://github.com/rphmeier/rustc-hex.git)" = "<none>"
 "checksum rustc_version 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b9743a7670d88d5d52950408ecdb7c71d8986251ab604d4689dd2ca25c9bca69"
 "checksum semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a3186ec9e65071a2095434b1f5bb24838d4e8e130f584c790f6033c79943537"