Support Editor vs Player References per Platform

[andreiborodin]

Today, we have a way for establishing different references to be pulled in for different platform. We need to do the same for Editor vs Player.

To make this work, the following must occur during a Player Build:

• Clean using InEditor configuration
• Build using Player configuration
• Perform the regular Unity player build
• Clean using Player configuration
• Build using InEditor configuration

Leverage Unity APIs.