Quick function to parse
GRangesList from character vector IGV / UCSC style strings of format gr1;gr2;gr3 where each gr is of format chr:start-end[+/-]
character vector representing a GRangesList with UCSC style coordinates (chr:start-end[+-]) representing a [signed] Granges and ";" separators within each item of x separating individaul each GRAnges
named integer vector representing genome (default = hg_seqlengths())
GRangesList parsed from IGV-/UCSC-style strings
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