[macOS] Proper usage of macOS filesystem layout

[HealsCodes]

Describe the bug
Currently Libation stores it's settings and default library in ~/Libation.
For macOS cluttering the user's home folder is very much frowned upon as there are suitable subfolders for everything (~/Documents, ~/Library/Preferences, ~/Library/Application Support/ and so on).

To Reproduce
Steps to reproduce the behaviour:

1. Start Libation on macOS

Expected behaviour

• Libation's settings and status files should be located in ~/Library/Application Support/Libation
• Libation's default library location should be something like ~/Documents/Libation/ or ~/Music/Libation/

Screenshots

• NA -

Platform

Mac / macOS 15.2

Log Files

• not required, it's not a process issue -