Split Northern Thai to nod and nod-thai

Most of the activity in translatewiki, Wikidata,
and Incubator is in the Tai Tham script, so set nod
to that. But there are also people who want to use
the Thai script, so allow it, too.

This also adds support for the Tai Tham script
(ISO 15924 Lana).

data/langdb.yaml

@@ -439,7 +439,8 @@ languages:
   nn: [Latn, [EU], norsk (nynorsk)]
  # There's also nb for Bokmål and nn for Nynorsk
   "no": [Latn, [EU], norsk]
-  nod: [Thai, [AS], คำเมือง]
+  nod: [Lana, [AS], ᨣᩴᩤᨾᩮᩥᩬᨦ]
+  nod-thai: [Thai, [AS], คำเมือง]
   nog: [Cyrl, [EU], ногайша]
   nov: [Latn, [WW], Novial]
   nqo: [Nkoo, [AF], ߒߞߏ]
@@ -724,7 +725,7 @@ scriptgroups:
   SouthAsian: [Beng, Cakm, Deva, Gujr, Guru, Knda, Mlym, Mtei, Olck, Orya, Rohg, Saur, Sinh, Sylo, Taml, Telu, Tibt, Thaa, Wara]
   Cyrillic: [Cyrl]
   CJK: [Hani, Hans, Hant, Kana, Kore, Jpan, Yiii]
-  SouthEastAsian: [Bali, Batk, Bugi, Java, Khmr, Laoo, Mymr, Thai]
+  SouthEastAsian: [Bali, Batk, Bugi, Java, Khmr, Laoo, Lana, Mymr, Thai]
   Mongolian: [Mong]
   SignWriting: [Sgnw]
   NativeAmerican: [Cher, Cans]

data/language-data.json

@@ -2820,6 +2820,13 @@
             "norsk"
         ],
         "nod": [
+            "Lana",
+            [
+                "AS"
+            ],
+            "ᨣᩴᩤᨾᩮᩥᩬᨦ"
+        ],
+        "nod-thai": [
             "Thai",
             [
                 "AS"
@@ -4530,6 +4537,7 @@
             "Java",
             "Khmr",
             "Laoo",
+            "Lana",
             "Mymr",
             "Thai"
         ],