Alex Greene 59972b121d flexible background color for point compositing
Summary:
Modified the compositor background color tests to account for either a 3rd or 4th channel. Also replaced hard coding of channel value with C.

Implemented changes to alpha channel appending logic, and cleaned up extraneous warnings and checks, per task instructions.

Fixes https://github.com/facebookresearch/pytorch3d/issues/1048

Reviewed By: bottler

Differential Revision: D34305312

fbshipit-source-id: 2176c3bdd897d1a2ba6ff4c6fa801fea889e4f02
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