Still creates a copy of FEXInterpreter from FEX for downstream projects to have some time to get off the old name. Creating a symlink is kind of a pain in cmake so just doing an install copy is easy.
Doesn't /quite/ remove the ArgumentLoader because it is intertwined with LinuxEmulation in an annoying way that will take another step to remove.
NFC FEXInterpreter is the supported path, rename things to reflect that.