Add support for FIX

This page is a capture in the deferred bucket of the product backlog — a pre-sprint idea, not yet pulled into a sprint as a story.

Links:

• GH: hffix: "The High Frequency FIX Parser library is an open source implementation of tagvalue FIX (classic FIX) intended for use by developers of high frequency, low latency financial software. The purpose of the library is to do fast, efficient encoding and decoding of FIX in place, at the location of the I/O buffer. The library does not use intermediate message objects, and it does no memory allocation on the free store (the “heap”)."