feat: 新增开机自启配置项，默认启用

app/src/main/java/com/lizongying/mytv/BootReceiver.kt

@@ -0,0 +1,19 @@
+package com.lizongying.mytv
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+
+class BootReceiver : BroadcastReceiver() {
+
+    override fun onReceive(context: Context, intent: Intent) {
+        val sp = context.getSharedPreferences("MainActivity", Context.MODE_PRIVATE)
+        if (sp.getBoolean(MainActivity.BOOT_STARTUP, true)) {
+            context.startActivity(
+                Intent(context, MainActivity::class.java)
+                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            )
+        }
+    }
+
+}