Let setting UI support for other program languages

[taooceros]

Discussed in #514

^{Originally posted by Zeroto521 September 21, 2020}

Question

As title.

More can see jjw24/Wox#178.

Discussion

I think just like using JSON-RPC for supporting other program languages.

Why not using some template file for support setting UI.

But at the same time, we need a tool to compile the file and inject in the Flow main program.

To make it just like a C# plugin.