Mouse box select mode

wanted somewhen to try make strategy game since armroy have GPU armatures for many units.. but i realized that like almost most thigns need make from scratch and so noobs like me need be math scientist to do so thats why i wanted ask for box select logic node so that can select units like in strategy games..

No file, test, or entry point is identified in the issue. Start by reading how Armory's logic nodes are organized and how unit selection is represented, then define the expected box-selection behavior and a way to verify that multiple strategy-game units can be selected.

Written by the indexing model from the issue text.