Transfer ownership warning dialog

Update READMEs
Display restriction id under UserRestrictionItem
Optimize some Shizuku-related features
Delay setting default affiliation id to wait Dhizuku initialize, fix #85

app/src/main/aidl/com/bintianqi/owndroid/IUserService.aidl

@@ -3,5 +3,5 @@ package com.bintianqi.owndroid;
 interface IUserService {
     void destroy() = 16777114;
     String execute(String command) = 1;
-    String getUid() = 2;
+    int getUid() = 2;
 }