Added espawn tool

After abstracting some of the implementation details of the compiler's finish_freezing back-end and bettering automatic environment configuration, I found it being used in more and more places.

Thanks to ECF the abstracted implementation was placed in a library that anyone can consume. The first consumer was the installers to check for an existing environment and then make intelligent decisions about what to show the user, and what to automatically configure for them.

Today I just finished up a little tool call espawn. It's already proved it worth in a few hours. It allows users to launch multiple processes asynchronously in an environment that finish_freezing creates for itself. In addition I can turn any x64 environment into a x86 and vice versa (provided the tools are installed.)

Check out there documentation here, espawn.