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.

manifest.json

@@ -8,5 +8,5 @@
   "sources": [
     "src/**/*.cs"
   ],
-  "depends": [ "characters_base>=1", "visual_novel_core>=1", "interface>=1", "items_base>=1", "quests_base>=1", "time_base>=1" ]
+  "depends": [ "characters_base>=1", "interface>=1", "items_base>=1", "quests_base>=1", "time_base>=1" ]
 }