Allow manual control of GuiRotatingMouseView

[oznogon]

Implement optional manual control of GuiRotatingMouseView elements, such as those used in DatabaseView.

The default initial behavior of the model rotating within the view is unchanged, except for new FoV checks that attempt to better fit the model in the viewport when the viewport is vertically oriented. On load, the model spins automatically within the viewport. When clicked/tapped, this feature allows the model view to be manually manipulated.

• Implement mouse click, drag, scrollwheel on element
  • Single left click resets to default spinning view behavior
  • Left click-drag rotates the model around its center, with constraints
  • Mouse wheel up zooms in, down zooms out
• Default view FoV constrained to avoid clipping in vertical aspect ratios; see https://www.litchiutilities.com/docs/fov.php on horizontal/vertical FoV conversion logic
• Enabled by default; GuiRotatingModelView::setManualRotationAllowed(false) to disable
• Touch interactions that are read as mouse inputs (two-finger scroll, tap-drag) also work

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