removed TaskCluster
added ClusterTask to run API
removed test_cluster
merged ModuleCluster and Machine, refactored Command, renamed task to attribute in settings, command
added targets in find to Machine, FindModule
min
removed default_task from settings, Machine
moved TaskSignal to signal as OperationSignal
Revert "moved TaskSignal to signal as OperationSignal"

This reverts commit 758c146f06345e9bc6e49dcbd2d448e857f5ca9f.
min
min
renamed initiated event to launched