Improve 3D Preview Sketch

[kkevn]

Improve the 3D preview to support a basic model of the hardware cube along with some basic effects such as color change and text scrolling.

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Edit - 01/16/2021
Create additional improvements to the 3D preview with:

• better heads up display buttons (currently too small and have no icons)
• ability to adjust sensitivity of cube rotation
• ability to change backdrop color/image

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Edit - 03/14/2021
Ability to change backdrop color/image of 3D preview sketch (among any other currently unlisted improvements) will be considered optional and not priorities.

[kkevn]

The 3D preview has been currently improved with the following features:

• better touch logic for a more fluid response
• button overlay on sketch for useful commands such as auto-rotate, reset position, and rotate left/right
• support for on-the-fly reading and previewing of custom effect list from Android app

[kkevn]

The 3D preview has been again improved with the following features:

• better heads up display buttons
• cube rotation sensitivity can be adjusted via preferences