Optional generation of extension (R.xx)

Optional generation of Colors/Fonts/Images/Stringium extension

Fix swiftlint warning

Sources/ResgenSwift/Analytics/Model/AnalyticsParameter.swift

@@ -18,7 +18,7 @@ class AnalyticsParameter {
     var replaceIn: [String] = []
 
     // MARK: - Init
-    
+
     init(name: String, type: ParameterType, value: String, defaultValue: String) {
         self.name = name
         self.type = type