Add Perspective/Orthographic Mode Toggle and FOV Adjustment

[Jersonrn]

What do you think about adding a button to switch between perspective mode and orthographic mode? I was a Makehuman user between 2014 and 2021 and I always ask me why its no posible change betwen Orthogonal and Perspective mode. I added a widget Checkbox to do easy chage modes, i too added a widget Slider to adjust FOV Angle.

Refactored the addZoom function to enhance zoom behavior in perspective projection. But I still think it needs to be improved.

https://github.com/user-attachments/assets/2e97bb5a-6d37-4d8c-962e-28612a763cf9