Optional generation of extension (R.xx)

Optional generation of Colors/Fonts/Images/Stringium extension

Fix swiftlint warning

Sources/ResgenSwift/Generate/Runnable/ImagesConfiguration+Runnable.swift

@@ -25,31 +25,23 @@ extension ImagesConfiguration: Runnable {
             inputFile.prependIfRelativePath(projectDirectory),
             "--xcassets-path",
             xcassetsPath.prependIfRelativePath(projectDirectory),
-            "--extension-output-path",
-            extensionOutputPath.prependIfRelativePath(projectDirectory),
             "--static-members",
             "\(staticMembersOptions)"
         ]
 
-        if let extensionName {
-            args += [
-                "--extension-name",
-                extensionName
-            ]
-        }
-
-        if let extensionNameUIKit {
-            args += [
-                "--extension-name-ui-kit",
-                extensionNameUIKit
-            ]
-        }
-
-        if let extensionSuffix {
-            args += [
-                "--extension-suffix",
-                extensionSuffix
-            ]
+        // Add optional parameters
+        [
+            ("--extension-output-path", extensionOutputPath?.prependIfRelativePath(projectDirectory)),
+            ("--extension-name", extensionName),
+            ("--extension-name-ui-kit", extensionNameUIKit),
+            ("--extension-suffix", extensionSuffix)
+        ].forEach { argumentName, argumentValue in
+            if let argumentValue {
+                args += [
+                    argumentName,
+                    argumentValue
+                ]
+            }
         }
 
         return args