Port tokenizer to C#

Another language change, another unrefactored (but already better tested) tokenizer

.editorconfig

@@ -0,0 +1,11 @@
+root = true
+
+indent_size = 4
+indent_style = tab
+
+[*.cs]
+
+trim_trailing_whitespace = true
+
+csharp_space_after_keywords_in_control_flow_statements = false
+csharp_indent_case_contents_when_block = false