[Version Update] Added custom rotation and distance options for model — DesktopMMD4:Born to Dance Steam update #3267931

1. Add custom rotation option for model: Select any loaded model on the theater page, uncheck "Always face forward" on the right panel, and then you can freely set the rotation of the model in the x, y, and z directions . 2. Add the distance option of model: Select any loaded model on the theater page, and adjust the model's distance option on the right panel. 3. Support directly dragging and rotating the model with the right mouse button: directly click and press the model on the desktop with the right mouse button, and then drag the model horizontally to freely rotate the model; left mouse button double-click the model to restore the original rotation.