979 - .Net Standard 2.0, Family Codes, Price-based Volatility, Minor Fixes

Unless otherwise noted, items below require TWS version 979 or higher.

    .Net Standard 2.0: .Net client library targets .Net Standard 2.0
    More complete family codes information (changes server-side)
    Added setConnectionOptions() to python API. Now you may add the "+PACEAPI" connection option, as with other API technologies.
    Price Based Volatility Quotes: See new available tick types 92-99 here: http://interactivebrokers.github.io/tws-api/tick_types.html
        TWS 980+ is required for these ticks
    Fixes: Minor fixes to python and C++ client libraries