Fixes and callbacks for Standings Overlay

[dirkaw]

Main fixes:

• Creates a callback OnSessionTypeChanged, OnSessionPhaseChanged and OnStatusChanged in SimDataProvider that HUDs can listen on.
  • IRacingDataProvider uses IRSDKSharpe's OnTelemetryData and OnSessionInfo listeners to update either telemetry (realtime) or session data.
  • StandingsOverlay uses the OnSessionTypeChanged events to clear the entry list and car class list when the session changes.
  • Makes HUDs only visible outside of pit and garage (maybe only in garage later)
  • fixes standings HUD ordering when car doesn't have a time set.