feature: report hibernation on the ping, and stop practice timers replaying after it

[lukepolo]

• the ping now carries hibernating=true|false so the panel can show it (feature: record when a server is hibernating api#514)
• Swiftly calls a server hibernating once world updates have kept arriving for 5s with no tick between them, which a map load or a plugin load never does; CounterStrikeSharp uses the engine's own hibernation event
• the practice plugin's 1s and 0.1s loops skip a run that comes sooner than half their interval, so the runs SwiftlyS2 replays after a spell without ticks no longer fire one a tick