Initial Release Candidate for v2.0

First candidate for v2.0 to be released. For public consumption.
TL;DR: Almost a complete re-write.

Highlights of the changes include:

• All suitable protocols now handle 64-bit data messages and are repeatable via an optional argument.
• Unit tests for almost all protocols.
• Far better and stricter decoding for most protocols.
• Address & command decoding for protocols where that information is available.
• Numerous bug fixes.
• Much more precise timing for generation of signals sent.
• Lower duty-cycles for some protocols.
• Several new protocols added, and some new sending and decoding routines for existing ones.
• Ability to optionally chose which protocols are included, enabling faster decoding and smaller code footprints if desired.
• Support for far larger capture buffers. (e.g. RAWLEN > 256)

Note: Existing projects using this library will require some minor modifications to work with v2.0.
Please examine the examples for the new #include requirements.