Maestro dumps its state files into `$HOME`

Some users don't like when programs write tmp/state/config files to their $HOME (me included).

Current behavior

Upon installation, Maestro creates the ~/.maestro directory and stores some data there.

Expected behavior

There exist a spec called XDG Base Directory Specification. Maestro should follow it.

Implementation idea

$ ls -1F ~/.maestro
bin/
deps/
lib/
sessions
tests/
tmp/
uuid

I suggest the following:

• bin/ should be in the path made for that, e.g. /usr/local/bin (or wherever your OS package manager installs programs)
• deps/ contains only the applesimutil binary, which we may not need soon, see #1797
• lib/ contains JARs. Not sure where they exactly they should go (let's look at how other JVM apps do this)
• sessions -> XDG_STATE_HOME
• tests/ -> XDG_STATE_HOME
• tmp/ -> XDG_CACHE_HOME (not sure what goes in there, it's always empty on my machine)
• uuid -> XDG_STATE_HOME

To support existing CLI installs, we should first look for ~/.maestro, and then fallback to XDG base dir spec.

Additional context

• Some logs are also saved in ~/Library/Logs/maestro (at least on macOS) (code link)
• Dotfile madness, very good read
• XDG_STATE_HOME in XDG Base Directory Spec
• Community contributions are welcome!