Fixed HMCL-dev#61

Fixed HMCL-dev#60

Fixed ClassCastException

Added removal of installers for Issue HMCL-dev#55

Fixed task system

Fix HMCL-dev#53

Merge pull request HMCL-dev#51 from tsl0922/master

Fix cpu ratio for mac

Fixed HMCL-dev#50

sponsor

Fixed NullPointerException when a version not exists.