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.
This was causing FEXServer to look in to global installed paths and
local paths for things when FEXServer was started.
Ensure it listens to FEX_PORTABLE so this doesn't occur.
This also requires us to scan both data directories and config
directories to find them.
Ryan Houdek