Removed extended ASCII, and added a check against it. (#4642)

src/CheckBasicStyle.lua

@@ -202,6 +202,9 @@ local g_ViolationPatterns =
 	-- Check if "else" is on the same line as a brace.
 	{"}%s*else", "else has to be on a separate line"},
 	{"else%s*{", "else has to be on a separate line"},
+
+	-- Don't allow characters other than ASCII 0 - 127:
+	{"[" .. string.char(128) .. "-" .. string.char(255) .. "]", "Character in the extended ASCII range (128 - 255) not allowed"},
 }