增加一些基本的界面自定义功能

app/src/main/java/io/legato/kazusa/constant/PreferKey.kt

@@ -162,6 +162,7 @@ object PreferKey {
     const val firebaseEnable = "firebaseEnable"
     const val cPrimary = "colorPrimary"
     const val cAccent = "colorAccent"
+    const val customMode = "customMode"
     const val cBackground = "colorBackground"
     const val cBBackground = "colorBottomBackground"
     const val bgImage = "backgroundImage"