Add env to toggle to automatically generate palworldsettings

[MSpreckels]

Context

resolves #326

Choices

Add an env var which is false by default that decides if the PalWorldSettings.ini is compiled from env vars automatically

Test instructions

Test Case: New Server, no automatic settings

1. Set DISABLE_GENERATE_SETTINGS to true
2. Start the server
3. On the server run cat /palworld/Pal/Saved/Config/LinuxServer/PalWorldSettings.ini
4. Verify that all values are default

Test Case: Existing Server, no automatic settings

1. Set DISABLE_GENERATE_SETTINGS to true
2. Modify or set SERVER_NAME environment variable
3. Start the server
4. On the server run cat /palworld/Pal/Saved/Config/LinuxServer/PalWorldSettings.ini
5. Verify that all values are still the same to prior launch and SERVER_NAME was not applied

Test Case: New Server, automatic settings

1. Set DISABLE_GENERATE_SETTINGS to false (or remove it entirely)
2. Start the server
3. On the server run cat /palworld/Pal/Saved/Config/LinuxServer/PalWorldSettings.ini
4. Verify that all values are as they were set as environment variables

Test Case: Existing Server, automatic settings

1. Set DISABLE_GENERATE_SETTINGS to false (or remove it entirely)
2. Start the server
3. On the server run cat /palworld/Pal/Saved/Config/LinuxServer/PalWorldSettings.ini
4. Verify that all values are as they were set as environment variables

Checklist before requesting a review

• I have performed a self-review of my code
• I've added documentation about this change to the README.
• I've not introduced breaking changes.

[thijsvanloef]

Tested it, and works great, the only thing I would still like is a small printf that notifies the users that the ENV vars will not be applied as the DISABLE_GENERATE_SETTINGS is true

[thijsvanloef]

LGTM :)