Added thread pool for unpacking#174

Szczyrk wants to merge 4 commits intodev/v3.17.x.xpatchkit-net/patchkit-patcher-unity:dev/v3.17.x.xfrom

features/v3.17.x.x/improved-unpackingpatchkit-net/patchkit-patcher-unity:features/v3.17.x.x/improved-unpackingCopy head branch name to clipboard