Refactor out the junk randomizer and put it in rituals where it belongs.

rituals.cpp

@@ -196,4 +196,25 @@ namespace ritual {
       contents.erase(item_id);
     }
   }
+
+  JunkPile random_junk(components::GameConfig &config, int count) {
+    dbc::check(count > 0, "cant' call random_junk with count < 0");
+    // this means the entity dropped loot, so make a lootable tombstone
+    ritual::JunkPile pile;
+    auto& junk = config.rituals["junk"];
+
+    ritual::JunkPile select_from;
+    for(auto& el : junk.items()) {
+      select_from.contents.push_back(el.key());
+    }
+
+    for(int i = 0; i < count; i++) {
+      size_t max_junk = select_from.contents.size();
+      auto& item = select_from.contents.at(Random::uniform(size_t(0), max_junk-1));
+      pile.contents.push_back(item);
+    }
+
+    dbc::check(pile.contents.size() > 0, "ritual::random_junk returned junk size == 0");
+    return pile;
+  }
 }