Obtain UCSC CpG islands and build CpG shore, CpG shelf, and open sea annotations.
This function is based on annotatr:::build_cpg_annots()
; however,
it obtains annotations for all genomes in the UCSC genome browser.
References
Based on annotatr:::build_cpg_annots()
,
see: https://github.com/rcavalcante/annotatr/blob/master/R/build_annotations.R