Scheduler: EventEvent hook
Scheduler: Simple task priorities

Examples/MultiMCLoop: Add example and test for multiple local multicast socket forwarding
PPI: Emit throttle/unthrottle messages on connector connect

Scheduler: Documentation

Scheduler/Console: Add 'sys' directory
Scheduler: Implement EventManager and 'sys/scheduler/events' command

Utils/Logger: More consistently support optional stream spec

Scheduler: Documentation update

Scheduler: Move remaining non-public implementation classes into 'detail' namespace
Adjust rest of SENF accordingly

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Scheduler: Clean up FIFORunner::TaskInfo interface
Update rest of senf to use the new API

Scheduler: Move task 'name' argument to constructor
Scheduler: Remove obsolete 'enabled_' members
Scheduler: Remove obsolete SchedulerTimer class

Scheduler: Fix FIFORunner exception safety
Scheduler: Implement new signal event API
Migrate SENF to use new signal API