Update s28 plugin for v2.3.0
Changes: https://wiki.race.twosixlabs.com/display/RACE2/TA2+Minimum+Changes+for+v.2.3.0
Branch: https://github.com/RACECAR-GU/plugin/tree/snowflake-rc-2.3.1
Still need to fix the same issue as in #57 (closed)
Edited by xqiu