v0.4.0

Additions:

• Added the size option for the custom periodic structures deserialization.
• Added the sizeof options for the custom periodic structures serialization.
• Non-intrusive serialization support.
• Demo of the NTP packet serialization by NESM (thanks to @FedericoCeratto )

Changes:

• Changed syntax of options inside type declarations. (was a: int32 {option: value} but now a: int32 as {option: value}).

Fixes:

• Fixed the global context changing when options have passed to the toSerializable macro
• Fixed incorrect enum size when the {.size.} pragma is passed to its declaration.
• Cleanup from the deprecated functions usage.
• Little refactoring.