[DayZ] Stable Native Linux Update

[redthirten]

Description

• Updates the DayZ (Experimental) Egg to be focused on the Stable branch of the DayZ dedicated server that now supports Linux natively. While I would no longer like to maintain the Egg to support the Experimental branch of the server, it should still be possible to run this branch by changing the "[Advanced] DayZ Dedicated Server App ID" variable.
• The Egg should now support running mods more reliably.
• Updated the Egg's README to have updated and better information.
• Updated the master README to reflect the Egg's directory change.

Incorporates and closes pelican-eggs/eggs#2021 (credit given in README)
Resolves #20
Resolves pelican-eggs/eggs#2749
Resolves pelican-eggs/eggs#1768

Discussion Questions:

• For egg-day-z.json, I just made a copy of egg-pterodactyl-day-z.json, reused the UUID from egg-day-z--experimental.json, and added "sort": null, to each Startup Variable. I don't know how to properly generate this file yet, so please let me know if there are issues with this.
• I removed -ip=0.0.0.0 from the startup command because it is not listed as a valid launch parameter. It seems to work fine for me with it included or removed, so let me know if anyone has issues with it removed and I can add it back.

Checklist for all submissions

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you tested and reviewed your changes with confidence that everything works?
• Did you branch your changes and PR from that branch and not from your master branch?

• You verify that the start command applied does not use a shell script
• The egg was exported from the panel