update v38.6

The last month of updates will feature 2 revamps and some new stuff, get ready!
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- Revamped the pianola (3 colors) and added a stand version for each
- Added the back-view version of the pianola (3 colors) and the back-view of the pianola on a stand
- Added a new piano chair (2 colors)
- Revamped the electric guitar (2 sizes, 3 colors) and added a stand version for each

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

See you and happy game-making! :)