Added thread pool for installation#173

Szczyrk wants to merge 1 commit intoexperimental/improved-download-unpacking-installationpatchkit-net/patchkit-patcher-unity:experimental/improved-download-unpacking-installationfrom

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