Start some cleanup

- add an editorconfig
- fix requirements.txt and the UTF-8 issue (lost in pull/47)
- two clean environments
- make black usable
- two test targets (wink2/wink3)

.editorconfig

@@ -0,0 +1,19 @@
+https://github.com/editorconfig/editorconfig/wiki/EditorConfig-Properties
+
+# editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 4
+tab_width = 4
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[Makefile]
+indent_style = tab
+
+[*.{yml,yaml}]
+indent_size = 2