Introduction

Document an optimized binary format for use by the process_event #5015 and other consumers of LDML data.
It will be written into the KMX binary file.

Goals

• new section is 64-bit aligned
• new section and header uses 64-bit offsets

implementation

• kmx_file.h - version16, kmx+ file header
• kmx+ optimized binary format
• in-memory structures for LDML keyboard

other

• json or xml streamers (dev use)
• binary streamer <-> into .kmx file (prod)
• use bson?