Adds a decent way to customize the folders the project file expects the
iso data and decompiler data to be in. When you run any version other
than the default, for example Jak 1 PAL, it uses the `gameName`
decompiler config to consume and output it's results.

However the project file will assume `jak1` unless you hard-code it
differently -- basically, it needs to be explicitly told just the
decompiler is told what version to use.

We now have a per-user REPL Config json file, so that can be used to
override the default `jak1` behaviour.

Fixes #1993