Introduced Utility Functions - Remove duplicate code snippets

[Phelms215]

Context

• Introduced utility function for Logging, SteamCMD and Discord Messaging
• Remove redundant (copy & paste) code snippets
• Remove nesting where possible
• Better Update/Install required logic
• Removed requirement for UPDATE_ON_BOOT for initial installation

Choices

• Clean up redundant code to make future enhancements easier to implement
• Removed requirement for UPDATE_ON_BOOT if server installation is not detected (no PalServer.sh or appmanifest file)

Test instructions

1. Started with old server version, ran through reboots with UPDATE_ON_BOOT and AUTOUPDATE flags set
2. Started new server and validated installation
3. Tested backup script
4. Tested discord messaging
5. Tested logging

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.

[Phelms215]

This PR has been rebased onto the latest main to integrate recent changes.
Conflicts have been resolved.
Added command for rcon-cli

[win5923]

I believe it's preferable to retain rcon-cli; otherwise, various adjustments will be required in the documentation.

[Phelms215]

I believe it's preferable to retain rcon-cli; otherwise, various adjustments will be required in the documentation.

The change doesn't remove rcon-cli or adjust anything public, just provided a function wrapper so the config didn't need to be supplied a dozen times

[win5923]

I believe it's preferable to retain rcon-cli; otherwise, various adjustments will be required in the documentation.

The change doesn't remove rcon-cli or adjust anything public, just provided a function wrapper so the config didn't need to be supplied a dozen times

You're right, I thought it was replacing rcon-cli with RCON. Thank you for clarifying！

[thijsvanloef]

@Phelms215 If you resolve the merge conflict, ready to merge!