tests: Add example values from spec

Is: Fix implementation

(With better testing for I8, I16, and I64)

Int: Fix implementation

Previously, these were encoded (and decoded) incorrectly.

UInt: Make encoding more efficient

(and compliant with upcoming standards)

* Example: Add time

* License: Use AGPLv3

* Struct: Add more features

* Data: Test constructor for primitive

* Readme: Add documentation, fix fromMess for U's and I's

* Primitives: Make Nothing class which is a void

* Primitives: Make Boolean class which is a bool

* Primitives: Make Str class which is a string

* Primitives: Add Integer type

* Strings: Support strings longer than 127 characters

* Primitives: Add example enum

* Primitives: Add UInt

* Primitives: Construct and support bool

* Primitives: Construct and test String type

* U8, U16, U32, U64 Constructor: Pass $mess by reference

* I8, I16, I32, I64: Implement mess