Add seed post-gen settings

src/components/BackgroundMusicPicker.vue

@@ -0,0 +1,45 @@
+<script>
+import { defineComponent } from 'vue';
+
+import localforage from "localforage";
+
+export default defineComponent({
+  data() {
+    return {
+      bgm: true,
+    };
+  },
+  async mounted() {
+    const savedvalue = await localforage.getItem("bgm");
+    if (savedvalue != null) {
+      this.bgm = savedvalue;
+    }
+  },
+  methods: {
+    patch(rom) {
+      if (this.bgm) {
+        rom[0x18021A] = 0x00;
+      } else {
+        rom[0x0CFE18] = 0x00;
+        rom[0x0CFEC1] = 0x00;
+        rom[0x0D0000] = 0x00;
+        rom[0x0D0001] = 0x00;
+        rom[0x0D00E7] = 0xC4;
+        rom[0x0D00E8] = 0x58;
+        rom[0x18021A] = 0x01;
+      }
+    },
+    async change() {
+      await localforage.setItem("bgm", this.bgm);
+    },
+  },
+});
+</script>
+
+<template>
+  <div class="form-check form-switch">
+    <input type="checkbox" class="form-check-input toggle" id="bgm"
+        role="switch" v-model="bgm" @change="change" checked />
+    <label class="form-check-label" for="bgm">Background Music</label>
+  </div>
+</template>