[Bug Report] Tool creates duplicated textures if shared across materials.

[SymphonyVR]

Describe the bug / バグの説明

If we have a texture that is used in more than 1 material a texture is created per material instead of having a shared texture for all of the material instances.

To Reproduce / 再現手順

Example:

1. Put the same texture in the albedo channel of 2 or more materials.
2. Convert the avatar by using the "Convert" option
3. Check in the output folder that we have the texture and material duplicated.

Expected behavior / 期待する動作

It should merge the textures and materials if they are the same to save in vram and size.

Screenshots / スクリーンショット

No response

Used assets / 使用したアセット

No response

VRCQuestTools version / VRCQuestToolsのバージョン

2.11.4

Unity version / Unityのバージョン

2022.3.22f1

Additional context / その他の情報

No response

[kurotu]

It's intended behavior. When a texture is shared from different materials, converted textures could be different because of original material properties.
However possibly we can optimize textures usage when they have completely same pixels.