如何将ProxyCore核心的代理功能独立出来使用，不要Recorder和WebServer

:+1: **AnyProxy** 非常灵活好用， 大赞！ :100:

#### Which platform are you running AnyProxy
Windows 7/10

#### The version of the AnyProxy
AnyProxy 4.1.0

#### Your expected behavior of AnyProxy
Recorder记录和WebServer需要消耗较多资源，但有许多应用场景只需要ProxyCore核心的代理功能，如果能够独立出来使用就非常好。
Recorder和WebServer如果能以独立插件的形式，也是不错的。

#### The actual behavior of AnyProxy
ProxyCore目前好像还不太好分离

#### The log of the error
无

The issue names ProxyCore, Recorder, and WebServer but no files, tests, or entry points. Start by mapping how ProxyCore currently depends on Recorder and WebServer, then define what a standalone ProxyCore use case requires; done means the core proxy can run independently and the other components can be separated as plugins.

Written by the indexing model from the issue text.