Collator for the "adder" (formerly basic-add) parachain and various small fixes (#438)

* update basic_add wasm

* wasm feature and collator feature

* move test parachains around a little

* fix wasm build for basic_add

* move basic_add to adder, introduce README

* minimal basic_add collator

* ensure collator messages are sent in the right order

* more logging

* route consensus statements to all peers

* minor bugfixes for parachains

* genesis builder accounts for parachain heads

* fix parachains tests

* targets for txpool

* tweak runtime + collator

* fix version in adder-collator

* consistency for overflowing

* adjust comment

* fix stable test run

* remove dummy registration test

* final grumbles

polkadot/test-parachains/adder/wasm/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "adder-wasm"
+version = "0.1.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+
+[dependencies]
+adder = { path = ".." }
+polkadot-parachain = { path = "../../../parachain", default-features = false }
+wee_alloc = { version = "0.4.1" }
+pwasm-libc = { version = "0.2" }
+tiny-keccak = "1.4"
+
+[lib]
+crate-type = ["cdylib"]
+
+[target.release]
+panic = "abort"
+lto = true
+
+[workspace]