About this release

This is the aesophia compiler version 2.0.0. The main changes compared to version 1.2.0 are:

Add Crypto.ecverify to the compiler.
Add Crypto.sha3, Crypto.blake2, Crypto.sha256, String.blake2 and String.sha256 to the compiler.
Add the bits type for working with bit fields in Sophia.
Use native bit shift operations in builtin functions, reducing gas cost.
Add Namespaces to Sophia in order to simplify using library contracts, etc.
Simplify calldata creation - instead of passing a compiled contract, simply pass a (stubbed) contract string.
Add a missig type check on the init function - detects programmer errors earlier.
Improve type checking of record fields - generates more understandable error messages.
Improved, more coherent, error messages.
Add the ACI (Aeternity Contract Interface) generator.