Fixed additional memory leaks

Fixed a few additional memory leaks

first tagged release of giert's fork

• COM init uses a locked OS thread + MTA, with cleanup on every error path
• Parsing/COM errors are returned, not panicked
• Fixed resource leaks and a use-after-free in GetRegisteredTasks
• Fixed TaskResult constants (were off-by-one)
• GetRegisteredTask "not found" now matches errors.Is(err, os.ErrNotExist)
• Replaced deprecated rickb777/date with maintained rickb777/period
• Added DefaultDefinition() and GetTasksInFolder()
• Up-front validation of more trigger/action constraints
• Requires Go 1.22+