Add missing HGInventoryService responsible for creating My Suitcase to StandaloneHypergrid.ini
Fix recent regression with llRegionSayTo() started sending messages twice.

Addresses http://opensimulator.org/mantis/view.php?id=7330
Fixed by removing chat delivery to avatar from WorldCommModule.DeliverMessageTo(), in common with existing similar methods that only handle deliver to script listeners.
Preserves fixes from http://opensimulator.org/mantis/view.php?id=5005
Move expired objects cleaning trigger to the maintenance thread of a region rather than it's main scene loop.

[Startup] default setting UpdateTempCleaningEveryNFrames becomes UpdateTempCleaningEveryNSeconds.
Default becomes 180s instead of effective 182s (which would also vary with any changes in frame time or extra long frames)