Resource ownership: battle sounds in, character actions out

- The win/defeat sounds (sounds/battle/winground, deadground) used by the
  battle report move here from visual_novel_core.
- The basic physics actions (attack, defence, stun) are character data
  every mod with characters uses; they move to characters_base.
- depends no longer lists visual_novel_core: the battle platform does not
  use the novel content.

characters/actions/physics_attack.json

@@ -1,17 +0,0 @@
-{
-  "Kind": "action",
-  "Items": [
-    {
-      "Id": "physics/attack",
-      "Name": "characters/action/physics_attack/name",
-      "Description": "characters/action/physics_attack/description",
-      "Image": "characters/actions/physics_attack",
-      "Type": "ToEnemy",
-      "Values": [
-        "RequiredPoint=1",
-        "Attack=1.0",
-        "AttackType=Physics"
-      ]
-    }
-  ]
-}

characters/actions/physics_defence.json

@@ -1,16 +0,0 @@
-{
-  "Kind": "action",
-  "Items": [
-    {
-      "Id": "physics/defence",
-      "Name": "characters/action/defence/name",
-      "Description": "characters/action/defence/description",
-      "Image": "characters/actions/physics_defence",
-      "Type": "ToAlias",
-      "Values": [
-        "RequiredPoint=1",
-        "Defence=4"
-      ]
-    }
-  ]
-}

characters/actions/physics_stun.json

@@ -1,17 +0,0 @@
-{
-  "Kind": "action",
-  "Items": [
-    {
-      "Id": "physics/stun",
-      "Name": "characters/action/stun/name",
-      "Description": "characters/action/stun/description",
-      "Image": "characters/actions/physics_stun",
-      "Type": "ToEnemy",
-      "Values": [
-        "RequiredPoint=2",
-        "AttackType=Physics",
-        "Turn=3"
-      ]
-    }
-  ]
-}