Add a script to strip trailing whitespace

Obsoletes #1498

scripts/dev/strip_whitespace.py

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+# Strip trailing whitespace from files in this repo
+
+find qutebrowser scripts tests \
+    -type f \( \
+        -name '*.py' -o \
+        -name '*.feature' -o \
+        -name '*.sh' \
+    \) -exec sed -i 's/ \+$//' {} +