Feature: Quick Stitch Option

[aparrapo]

On set, having quick turnaround times on renders is crucial: it helps uncover setup issues (i.e. flipped cameras). A "quick stitch option" on the UI would skip calibration and background entirely, and directly produce depth estimates and a color equirect at low res.

The current behavior and new feature

Render: To see whether the camera arrangement is proper, we must go through the entire pipeline to produce an equirect. Having a quick stitch allows a quick glance first pass sanity check, which could save hours down the road.

Expected use cases

Will be useful for end users (i.e. producers on set).