logger: add a dedicated QML logging Singleton

- adds log.info/error/debug/warn/fatal
- adds ability to write logs to any file
- add CLI options in addition to env to set log levels

quickshell/Services/LocationService.qml

@@ -3,8 +3,6 @@ pragma ComponentBehavior: Bound
 
 import QtQuick
 import Quickshell
-import Quickshell.Io
-import qs.Common
 
 Singleton {
     id: root