goalc/repl: Allow hot-loading files via `ml` with just the object name (#2036)

This allows you to not have to define the entire file path to a source
file to re-compile and load it. Technically a stop-gap until editor
tools are developed around writing OpenGOAL.


![image](https://user-images.githubusercontent.com/13153231/203196148-de61cf4b-42c8-43dc-a7fd-80e6ba6f5ac2.png)

As opposed to `(ml "goal_src/jak2/engine/game/main.gc")` (which still
works)

This is accomplished via the following config (connection attempts is
irrelevant):
```json
{
  "numConnectToTargetAttempts": 1,
  "jak2": {
    "asmFileSearchDirs": [
      "goal_src/jak2"
    ]
  }
}
```

This also provides a way to make game-specific configurations for the
REPL fairly easily.