Fixed changelog for next release

Added `get_producers` example

Added release instructions

Some deprecation notices

- Renamed `TypeSize.UInt8` to `TypeSize.Uint8`
- Renamed `TypeSize.UInt16` to `TypeSize.Uint16`
- Renamed `TypeSize.UInt32` to `TypeSize.Uint32`
- Renamed `TypeSize.UInt64` to `TypeSize.Uint64`
- Renamed `TypeSize.UInt128` to `TypeSize.Uint128`
- Renamed `Decoder.ReadUInt8` to `Decoder.ReadUint8`

Added support for binary extension

Fixes #60

Now supporting variant in ABI decoding

Fixes #59

Extracted ActionTraceReceipt so it can be copied to inline trace in s…

…imulation

Fixed NewMoveToSavings that was not correctly adding the REX value to…

… the action

Fixed ReadSymbol binary decoding and Symbol encoding

A Symbol is encoded using a single 64 bits value. However, the decoder
was instead assuming a precision 8 bits followed by a string encoded
binary data.

In fact, a symbol is encoded using a single 64 bits value, the most
significant byte being the precision and the rest is interpreted as a
SymbolCode.