Squashed 'External/Rx/' content from commit d56e5d1

git-subtree-dir: External/Rx
git-subtree-split: d56e5d1076bf2d6e5eacee2b03420a32fb354bbc
Merge commit '7a01a9867fd790b31544f8e5effa69569be64f01' as 'External/Rx'
Initial version, 0.1.0.0
Currently just creates a draft using the hardcoded ITV-1 strategy.
Only content that's specific to Hearthstone is the hardcoded list of filters, though I think it wouldn't be a terrible problem to add more to it.