[Feature] Add `target` optional attribute to presets

[Passeriform]

stage "backup" {
    // Windows
    preset "choco" {
        target "L:\\CollateDir"
    }
    // Linux
    preset "gem" {
        target "/home/username/CollateDir"
    }
    // MacOS
    preset "npm" {
        target "/Users/username/Application/Collate/target"
    }
    // Relative to global target
    preset "pip" {
        target "$Target/pip-backup"
    }
  ...