Allow promote to variable on Color structs/Vertex Colors structs for Procedural Mesh components

Issue:

Currently, it is not possible to make a variable of type "Color" specifically for the color struct on procedural mesh components (see image attached). This is the only variable on procedural mesh components that cannot be promoted to a variable and requires an inconvenient set of steps to be able to alter effectively.

Request:

Allow "promote to variable" and variable use for color struct when affecting procedural mesh components.

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