performance(Drawable): Rework for IterateDrawablesInRegion Functions for both GameClient and W3DView to be more Efficient

[IamInnocent3X]

To use the features, RETAIL_COMPATIBLE_DRAWUPDATE must be set to 0. The feature is Retail Xfer Compatible, but might require checking. RETAIL_COMPATIBLE_DRAWUPDATE can be removed once the check is done.

• GameClient: Informs whenever a New Drawable has been registered or a Drawable has Moved. If the Drawable is within the Screen Region, it will be registered onto a Drawable List. The List is reset everytime the Camera Moves or a Stealthed Object has been Detected, or a Unit has Transitioned a Disguise. Resetting means it will reiterate the Drawable List from the first and registers Drawables that fits within the Screen onto the List.

Above directly addresses the Issue - #1502

• W3DView: Used for Selecting. Edited Function converts the Selection Region onto a Radius and gets its Center, then uses Partition Manager to find List of Drawables within the Region. Has a configured minimum Iterate Radius of 200.0f units as a Requirement to Select Airborne Units when selecting with a small region.