Module/oncokb maf annotation

[johnoooh]

Adding a oncokb maf annotation module. I created the oncokb folder so we can add other oncokb scripts to it in the future, such as annotate CNV, among others. You need to add a oncokb token for this to work. I tested it locally with mine. Also, the container PR is here mskcc-omics-workflows/containers#27 but the module doesn't currently use this container, it uses a placeholder on my own dockerhub.

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