add a new plot (ideogram)

[fmalmeida]

Generate a ideogram plot (with karyoploteR) using a feature type or attribute key selected by the user.

Obs: It would require a .fai (samtools faidx) or genome file as input to get the chr sizes.

[fmalmeida]

Already being tackled in https://github.com/fmalmeida/gff-toolbox/tree/develop develop branch.

It is already producing the plot. Just needs to update the documentation, the conda recipe and requirements, and make better defaults for the plot.

[fmalmeida]

This module seems almost ready. Already implements with compressed or uncompressed files. But, for now it only plots one feature at a time.

Must make this module understand more than one feature, and plot them with different colors