v0.4.0

Added Zagreus as an additional goal option, changed some other goal options to include him
When a route is completed (Meaning that routes boss has been defeated the amount of times required by the YAML), all of the core locations from that route are released.
Hopefully fixed the bug where some players got "APWorld appears to be invalid or damaged" error message when trying to install the APWorld? I think I was just packaging it incorrectly, but it always worked for me, so I don't really have a way to test this.
Added /deathlink command to the client so you can enable/disable deathlink mid-run

Zagreus' stuff has only been tested once since I don't have a ton of time to test, marking this as prerelease for that reason.