特定のプラットフォームに設定されているアイコンのリストを取得します。
Most platforms support viewing icons in multiple sizes so Unity lets you specify multiple icon textures for each platform. Each texture in the returned array correspond to the corresponding entry in the list of icon sizes returned by GetIconSizesForTargetGroup. By default it returns all icons for a specified platform unless an IconKind value is specified. Currently only iOS supports icons which have a different kind than IconKind.Application.