improve subscription system and customize subscription for user

[zhongfq]

First of all, if you don't customize subscription, the behavior as same as before.

Feature:

1. support for adding proxy(same as add host)
2. support for adding proxy group(select, url-test, load-balance, fallback, relay)
3. support for adding rule(DOMAIN, DOMAIN-SUFFIX, ...)
4. support for adding ruleset
5. support for managing subscription of user(select proxy or proxy group for user)

How to user(customize subscription detail):

1. click subscription icon in user dialog
   

2. add host(tagged host) to user:
   

3. also, you can set different subscription url prefix for each user.

Revoke subscription:

1. click the revoke button
   

2. revoke user subscription also will reset password or id for the protocol, after this operation, the all previous subscriptions are invalid.
   

Add rule or ruleset:

The clash subscription look like this:

[LonUp]

این اپشن واقعا عالیه . و درمان خیلی از مشکلاته . کاش با پروژه اصلی مرج بشه .