[UI] Add note that Vixen 3 now supports direct .fseq export
(cherry picked from commit b2a84bb299fe155632294cf0b040867186f15084)
Merge branch 'stage' into v0.4.0
Merge branch 'v0.4.0' of github.com:FalconChristmas/fpp into v0.4.0
Merge branch 'v0.4.0' of github.com:FalconChristmas/fpp into v0.4.0