Feature/vcf2maf

[rnaidu]

• [] If you've fixed a bug or added code that should be tested, add tests!
• [] If you've added a new tool - have you followed the module conventions in the contribution docs
• [] If necessary, include test data in your PR.
• [] Remove all TODO statements.
• [] Emit the versions.yml file.
• [] Follow the naming conventions.
• [] Follow the parameters requirements.
• [] Follow the input/output options guidelines.
• [] Add a resource label
• [] Use BioConda and BioContainers if possible to fulfil software requirements.
• Ensure that the test works with either Docker / Singularity. Conda CI tests can be quite flaky:
  • [] nf-test test --profile=docker --tag
  • [] nf-test test --profile=singularity --tag
  • nf-test test --profile=conda --tag