v3.0.0.beta2

f70e382 Merge pull request #149 from jeevatkm/rwh-v3-beta2
448b839 add known headers caps value #131
85e4af3 add 10s ability to forward all message headers using rwh #131 #91 #83
b5ec615 add RWH menu to message display tab with disable rwh for 10 seconds on the current message #83 #91
63257e2 improve transform subject prefix within attribution too #103
a1e9348 handle new message compose type and yield #103
c4e02ce replace innerhtml with domparser then fetch first element child #103
6f69294 fix: open options via menu #103
d38863e update features image to latest #103 (#148)