LM12UU based version of MaduixaCNC

I took the original MaduixaCNC model and modified several parts to make it work using 12mm steel rods in place of the 8mm and LM12UU linear bearings instead of the 8mm bearings.

In addition, I also modified y-carriage-cnc and y-triangle-CNC to make them into 1 part (called y-carriage-cnc_short+X support_left and _right). It makes the connection between them stronger, I might make it bigger in the Y direction in the future to improve stability of the y carriage.

Another change is a small di