Improve VEP

[maxulysse]

• Update VEP from 95.1 to 95.2
• Removed --database option for VEP cf: VEP docs
• Add tabix indexed cache for VEP
• Reduce number of CPUs for RunVEP to 4 cf: VEP docs
• VEP cache has now fasta files for --HGVS
• Merge buildContainers.nf and buildReferences.nf in build.nf
• New DownloadCADD process to download CADD files
• Add cadd_WG_SNVs, cadd_WG_SNVs_tbi, cadd_InDels, cadd_InDels_tbi and cadd_cache params
• Use cadd_cache param for optional use of CADD VEP plugin in annotate.nf
• Specify values for cadd_WG_SNVs, cadd_WG_SNVs_tbi, cadd_InDels, cadd_InDels_tbi and cadd_cache params in munin.conf file
• Update documentation

PR checklist

• PR is made against dev branch
• This comment contains a description of changes (with reason)
• Ensure the test suite passes (./scripts/test.sh -p docker -t ALL).
• Documentation in docs is updated
• CHANGELOG.md is updated

[maxulysse]

@KochTobi
Regarding your VEP issue, this is best I can do without going deeper and using intervals for the VCF files as well.
On my test the running time was reduced from 2h50 to ~ 1h40, mainly by tabix indexing the VEP cache directory

@szilvajuhos
We can now use the VEP CADD plugin, I added some specific params in the munin config file, and the files are already there.
So you just need to add --cadd_cache to enable it.
I'll look into the other plugins Teresita wants to use