Feature Request: Iterating on a Single Source File

The UnrealVS extension has an option for compiling a single file and building the project with just that change. Effectively it disables unity building and adds the -singlefile argument. This should greatly reduce iteration time. With this, Rider will truly be the goto for Unreal C++ editing.

Source:
https://docs.unrealengine.com/en-US/ProductionPipelines/DevelopmentSetup/VisualStudioSetup/UnrealVS/index.html

Start by reviewing the linked UnrealVS documentation and locating how UnrealLink invokes project builds. Determine where unity building is controlled and how a single-file build would pass the -singlefile argument. Done means an option can disable unity building and build the project using only the changed source file.

Written by the indexing model from the issue text.