Import: Added band and character import

Use 'npm run import' to import from assets/import/{bands,characters}.
Existing entries are not overwritten!

assets/import/example_band.json

@@ -0,0 +1,7 @@
+{
+    "id": "1",
+    "name": "BAND-MAID",
+    "description": "Band-Maid (stylized as BAND-MAID) is an all girl rock band from Tokyo that formed in July 2013. The band combines a rock sound with a maid image modeled on Japanese maid cafés.",
+    "imageURL": "https://cdn.discordapp.com/attachments/851543504831119380/1009467684490063892/unknown.png",
+    "enabled": 0
+}