PRX-8 Copy interpreter directive into output
If an application has an interpreter directive, it will get copied into the final output.
This probably won't get used much, but it's easy to add.
Also:
- Make newline used for output configurable
- Change newline used for output to be just `\n` on all platforms. Part of my ongoing crusade to ban all use or `\r\n` :P But it's also crucial to make the interpreter directive work out of the box. `\r` gets interpreted as part of the command line on Linux.