chocolateDoom and chocolateDoomMaster added

chocolate doom is a port that aims to recreate the experience of Doom in the 1990s
as accurately as possible
Add notice for chocolateDoomMaster
Fix chocolateDoom and chocolateDoomMaster descriptions
unetbootin: 603 -> 608
nox: updated sha to work after the recent fetchgit changes
Merge pull request #4006 from madjar/master

I'm not sure whether fetchgit with `leaveDotGit` can ever be made deterministic... But I'll merge anyway.
Revert "fixes #1923"

This reverts commit 1849840aa3d967ea9b943d79a7b56860570fd28a.

Breaks git-annex
Merge pull request #3934 from MP2E/chocolate-doom

chocolateDoom and chocolateDoomMaster added