Enhance safe template linter.

- Lint directories and files in sorted order.
- Lint python blocks in Mako.

scripts/safelint_thresholds.json

@@ -1,32 +1,32 @@
 {
     "rules": {
-        "javascript-concat-html": 230,
+        "javascript-concat-html": 229,
         "javascript-escape": 7,
-        "javascript-interpolate": 66,
-        "javascript-jquery-append": 114,
-        "javascript-jquery-html": 304,
+        "javascript-interpolate": 65,
+        "javascript-jquery-append": 113,
+        "javascript-jquery-html": 303,
         "javascript-jquery-insert-into-target": 26,
-        "javascript-jquery-insertion": 30,
+        "javascript-jquery-insertion": 28,
         "javascript-jquery-prepend": 12,
         "mako-html-entities": 0,
         "mako-invalid-html-filter": 33,
         "mako-invalid-js-filter": 222,
         "mako-js-html-string": 0,
         "mako-js-missing-quotes": 0,
-        "mako-missing-default": 234,
+        "mako-missing-default": 231,
         "mako-multiple-page-tags": 0,
         "mako-unknown-context": 0,
         "mako-unparseable-expression": 0,
         "mako-unwanted-html-filter": 0,
         "python-close-before-format": 0,
-        "python-concat-html": 28,
+        "python-concat-html": 27,
         "python-custom-escape": 13,
-        "python-deprecated-display-name": 53,
+        "python-deprecated-display-name": 57,
         "python-interpolate-html": 68,
         "python-parse-error": 0,
         "python-requires-html-or-text": 0,
-        "python-wrap-html": 279,
+        "python-wrap-html": 297,
         "underscore-not-escaped": 709
     },
-    "total": 2405
+    "total": 2426
 }