userdiff: better method/property matching for C#

- Support multi-line methods by not requiring closing parenthesis.
- Support multiple generics (comma was missing before).
- Add missing `foreach`, `lock` and  `fixed` keywords to skip over.
- Remove `instanceof` keyword, which isn't C#.
- Also detect non-method keywords not positioned at the start of a line.
- Added tests; none existed before.

The overall strategy is to focus more on what isn't expected for
method/property definitions, instead of what is, but is fully optional.

Signed-off-by: Steven Jeuris <steven.jeuris@gmail.com>
Acked-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t4018/csharp-exclude-assignments

@@ -0,0 +1,20 @@
+class Example
+{
+    string Method(int RIGHT)
+    {
+        var constantAssignment = "test";
+        var methodAssignment = MethodCall();
+        var multiLineMethodAssignment = MethodCall(
+        );
+        var multiLine = "first"
+            + MethodCall()
+            +
+            ( MethodCall()
+            )
+            + MethodCall();
+
+        return "ChangeMe";
+    }
+
+    string MethodCall(int a = 0, int b = 0) => "test";
+}