fix wmltools' parse_attribute to not consider pango color hashes as a comment

While there are many places that wmllint assumes that "#" begins a comment, from Vultraz's description it sounded like parse_attribute was being used to find the attribute's value, and then a string_strip was done on the value. So I looked for the direct cause in wmltools.

Again, the solution is to look for whitespace to precede the hashsign.

Incidentally, I don't know why the original code had the first "where -= 1", then had value and comment go from [:where+1] and [where+1:].

data/tools/wesnoth/wmltools.py

@@ -60,13 +60,10 @@ def parse_attribute(line):
     leader = line[:where]
     after = line[where+1:]
     after = after.lstrip()
-    if "#" in after:
-        where = after.find("#")
-        where -= 1
-        while after[where] in (" ", "\t"):
-            where -= 1
-        value = after[:where+1]
-        comment = after[where+1:]
+    if re.search("\s#", after):
+        where = len(re.split("\s+#", after)[0])
+        value = after[:where]
+        comment = after[where:]
     else:
         value = after.rstrip()
         comment = ""