Improve split logic in gtf tags

[abreschi]

This line fails when some tags are like: tag1 "gene function; ABC1". This happens in Ensembl gtfs which have GO terms as tags

ggsashimi/sashimi-plot.py

Line 288 in 1813aec

d = dict(kv.strip().split(" ") for kv in tags.strip(";").split("; "))

[stale]

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