Break tools out into their own dirs

tools/autoflake/BUILD

@@ -0,0 +1,7 @@
+py_binary(
+    name = "autoflake",
+    main = "__main__.py",
+    deps = [
+        py_requirement("autoflake"),
+    ]
+)

tools/autoflake/__main__.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python3
+
+"""
+Shim for executing autoflake.
+"""
+
+import re
+import sys
+
+from autoflake import main
+
+
+if __name__ == "__main__":
+    sys.argv[0] = re.sub(r"(-script\.pyw|\.exe)?$", "", sys.argv[0])
+    sys.exit(main())