Release Europa for substrate v3.0.0 version, set larger MaxCodeSize

This version is substrate-v3.0.0-1 version, it just set a larger MaxCodeSize as 4M+512B.

Tmp release for Europa v0.2 report 2.2.3 test

just for Europa v0.2 report 2.2.3 test. This is a defective release, for in this release, we change type Balance = u128 to type Balance=u64 for test.

Europa framework and node v0.2.0

1. for Europa framework:

   • update substrate dependencies

2. for Europa node:

   Modify at FRAME Contracts pallet level to provide more information.

   • Providing detailed contract execution information.
   • Adding log feature in ChainExtension
   • Providing Wasm backtrace when contract meets panic in execution.

Europa node v0.1.1

This release is based on Europa v0.1.0, just add Patract's pallet-contracts in vendor for Patract contract feature.

Europa framework v0.1.0

Europa is a sandbox framework for substrate runtime. In v0.1.0, we implement the following things:

1. Europa sandbox framework is another implementation for Substrate client.
2. Europa framework doesn’t have consensus system, and it can produce block directly.
3. Europa framework removes all related parts which are used for supporting runtime Wasm.
4. This framework provides state-kv database.
5. This framework provides some special RPC method for sandbox feature.
6. This framework provides workspace to isolate different execution environments.

Release Europa for substrate v3.0.0 version

This release is based on Europa v0.2.0 version, and it's used for developers who need to use europa framework in substrate v3.0.0 dependencies.

In the projects which are using substrate v3.0.0 dependencies, developers could integrate europa framework as following:

sp_io = { version = "3.0.0" }  # substrate dependency
ec-service = { git = "https://github.com/patractlabs/europa", tag = "substrate-v3.0.0" } # europa dependency

Release Europa for substrate v2.0.0 version

This release is based on Europa v0.1.0 version, and it's used for developers who need to use europa framework in substrate v2.0.0 dependencies.

In the projects which are using substrate v2.0.0 dependencies, developers could integrate europa framework as following:

sp_io = { version = "2.0.0" }  # substrate dependency
ec-service = { git = "https://github.com/patractlabs/europa", tag = "substrate-v2.0.0" } # europa dependency

test-ci

fix readme/doc for cargo-contract (#57)