♻️ Reorganise code for optimal code sharing, add phpmon-cli

- Moved over common functionality to package
- Added phpmon-cli target (for fast switching via the terminal)

phpmon-cli/AllowedArguments.swift

@@ -0,0 +1,23 @@
+//
+//  AllowedArguments.swift
+//  phpmon-cli
+//
+//  Created by Nico Verbruggen on 20/12/2021.
+//  Copyright © 2021 Nico Verbruggen. All rights reserved.
+//
+
+import Foundation
+
+enum AllowedArguments: String, CaseIterable {
+    case use = "use"
+    
+    static func has(_ string: String) -> Bool {
+        return Self.allCases.contains { arg in
+            return arg.rawValue == string
+        }
+    }
+    
+    static var rawValues: [String] {
+        return Self.allCases.map { $0.rawValue }
+    }
+}