Add moji property for all / most of the definitions

[jonathanwiesel]

Many definitions in the index.json have their moji property missing.

For example:

"airplane_arriving": {
  "unicode": "1F6EC",
  "unicode_alternates": [],
  "name": "airplane arriving",
  "shortname": ":airplane_arriving:",
  "category": "travel_places",
  "aliases": [],
  "aliases_ascii": [],
  "keywords": [
    "flight",
    "transportation",
    "vehicle",
    "plane",
    "airport",
    "travel",
    "airlines",
    "fly",
    "jet",
    "jumbo",
    "boeing",
    "airbus"
  ]
}

Should have a property "moji": 🛬.

[jonathanwiesel]

Still around 600+ definitions have no moji. Most of them are because tone modifiers.

[jonathanwiesel]

Still 100 missing mojis