Package epoll - Namespaces

• System.Linux.Epoll
• System.Linux.Error
• System.Linux.EventFD

  This provides wrappers around the `sys/eventfd.h` module: An "event" file descriptort that can be monitored via `epoll` and written to programmatically to wake up a dormant thread.
• System.Linux.File
• System.Linux.SignalFD
• System.Linux.TimerFD