Try to improve text-selection for Type3 fonts that utilize a non-default /FontMatrix (bug 1513120)

For Type3 fonts text-selection is often not that great, and there's a couple of heuristics used to try and improve things. This patch simple extends those heuristics a bit, and fixes a pre-existing "naive" array comparison, but this all feels a bit brittle to say the least.

The existing Type3 test-coverage isn't that great in general, and in particular Type3 `text` tests are few and far between, hence why this patch adds *two* different new `text` tests.

test/pdfs/.gitignore

@@ -93,6 +93,7 @@
 !bug1146106.pdf
 !bug1245391_reduced.pdf
 !bug1252420.pdf
+!bug1513120_reduced.pdf
 !issue9949.pdf
 !bug1308536.pdf
 !bug1337429.pdf

test/test_manifest.json

@@ -1016,6 +1016,20 @@
        "link": false,
        "type": "eq"
     },
+    {  "id": "bug1245391-text",
+       "file": "pdfs/bug1245391_reduced.pdf",
+       "md5": "6c946045ee0f2f663f269717c0f1614a",
+       "rounds": 1,
+       "link": false,
+       "type": "text"
+    },
+    {  "id": "bug1513120-text",
+       "file": "pdfs/bug1513120_reduced.pdf",
+       "md5": "e88ad8b5bb385296f475ca51ce0d216d",
+       "rounds": 1,
+       "link": false,
+       "type": "text"
+    },
     {  "id": "bug1250079",
        "file": "pdfs/bug1250079.pdf",
        "md5": "a1dd21a70ae7097d96273e85a80b26ef",