dvb-emsg 0.1.0

MPEG-DASH Event Message Box (`emsg`) — inband DASH/CMAF timed events (SCTE 35, ID3, ad triggers): version 0/1 FullBox parse + serialize. Box syntax per ISO/IEC 23009-1 §5.10.3.3; field semantics per DASH-IF IOP Part 10.