update v38.7

The last month of updates will feature 2 revamps and some new stuff, get ready!
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- Revamped the kid pianola (2 colors) and added a version on a stand (2 colors)
- Revamped the amplifiers (2 sizes) and adde an animation to it (2 sizes)
- Revamped the drums (3 colors)

*Everyone who already bought the asset can get the new stuff for free

See you and happy game-making! :)