Add early battle backgrounds and unit class seals

data/defs/items.json

@@ -97,6 +97,7 @@
   "war_drum": {
     "name": "War Drum",
     "kind": "accessory",
+    "icon": "res://art/items/war_drum.png",
     "accessory_type": "accessory",
     "bonuses": { "atk": 1, "agi": 1 },
     "effects": [],
@@ -105,6 +106,7 @@
   "imperial_seal": {
     "name": "Imperial Seal",
     "kind": "accessory",
+    "icon": "res://art/items/imperial_seal.png",
     "accessory_type": "accessory",
     "bonuses": { "mp": 4, "int": 1 },
     "effects": [],

data/scenarios/003_xingyang_ambush.json

@@ -142,6 +142,7 @@
   "map": {
     "width": 12,
     "height": 9,
+    "background": "res://art/backgrounds/xingyang_forest_ambush.png",
     "terrain": [
       "GGGFFRRGGGGG",
       "GGGFFRRGHHGG",

data/scenarios/004_qingzhou_campaign.json

@@ -122,6 +122,7 @@
   "map": {
     "width": 14,
     "height": 10,
+    "background": "res://art/backgrounds/qingzhou_village_road.png",
     "terrain": [
       "GGGGGGGGGGGGGG",
       "GGGFFFGGGHHGGG",

data/scenarios/005_puyang_raid.json

@@ -117,6 +117,7 @@
   "map": {
     "width": 14,
     "height": 10,
+    "background": "res://art/backgrounds/puyang_raid_camp.png",
     "terrain": [
       "GGGGGHHGGGGGGG",
       "GGGFFHHGGGFFGG",