Added missing argument scope implementations (#2945)

Author: AndreasArvidsson

data/fixtures/scopes/csharp/argumentList.actual.constructor2.scope

@@ -1,23 +1,23 @@
 new Foo(
-    a,
-    b
+    aaa,
+    bbb
 );
 ---
 
 [Content] =
 [Removal] = 0:8-3:0
           >
 0| new Foo(
-1|     a,
-2|     b
+1|     aaa,
+2|     bbb
 3| );
    <
 
 [Domain] = 0:0-3:1
   >--------
 0| new Foo(
-1|     a,
-2|     b
+1|     aaa,
+2|     bbb
 3| );
    -<
 

data/fixtures/scopes/csharp/argumentList.actual.method2.scope

@@ -0,0 +1,13 @@
+new Foo(aaa, bbb);
+---
+
+[Content] =
+[Removal] = 0:8-0:16
+          >--------<
+0| new Foo(aaa, bbb);
+
+[Domain] = 0:0-0:17
+  >-----------------<
+0| new Foo(aaa, bbb);
+
+[Insertion delimiter] = ", "