Motifscan

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* Replace new special characters '/' and '*' to '_' for motif names
* Better type definition in score.C

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* Fix a variable definition in C loop (C99)

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* Brand-new MotifScan package for Python version 3.6+.
* Use a config module to manage the genome and motif data paths.
* Download genome assembly from UCSC and motif sets from JASPAR2020.
* Support multiple input formats (BED, MACS, MACS2, narrowPeak etc.).
* Enable to run multiple processes when scanning motifs.
* Speed up calculating motif scores with a C extension.
* Bug fixes and performance improvements.