Add lots of new natives and a new feature to destroy/count natives

Added: Streamer_GetTickRate, Streamer_GetMaxItems,
Streamer_GetVisibleItems, Streamer_GetCellDistance,
Streamer_GetCellSize, Streamer_IsToggleIdleUpdate,
Streamer_IsToggleItemUpdate, Streamer_DestroyAllItems,
Streamer_CountItems

Renamed: Streamer_TickRate, Streamer_VisibleItems,
Streamer_CellDistance, Streamer_CellSize (all natives begin with
Streamer_Set* now, but old natives are still usable)

Deprecated: DestroyAllDynamic* and CountDynamic* natives (new natives
Streamer_DestroyAllItems and Streamer_CountItems are preferred now, but
old natives are still usable)

A parameter called "serverwide" was also added to the destroy and count
natives. It is set to 1 by default in the include file, but if set to 0,
the natives will only destroy or count items within the calling script.