A standalone app implementation of KernelSU WebUI

Applicable to Magisk, KernelSU & APatch.

In addition to executing boot scripts and modifying system files, KernelSU's modules also support displaying UI interfaces and interacting directly with users.

The module can write HTML + CSS + JavaScript pages through any web technology. KernelSU's manager will display these pages through WebView. It also provides some APIs to interact with the system, such as executing shell commands.