Switch rendering engine

[marcomq]

Webview currently doesnt't support file urls anymore. At least not in the latest version on windows. Therefore, nimview will need to switch the used library to something else, supporting file urls.

The current candidate is https://github.com/tauri-apps/wry but this is unfortunately a rust library. So it would be required to build some Nim / C Wrapper first.

There might also be other libraries that can be used:
https://github.com/Elanis/web-to-desktop-framework-comparison

Requirements:

• support Windows, MacOS and Linux
• lightweight
• support calling Javascript from Backend
• doesn't require sockets - uses file urls

[marcomq]

I had a first look at tauri 1.0 - and to be honest - it looks really good and advanced. It has an app creater helper, packager, auto refresh after code change and auto-update features. It also still looks lightweight.
It think nimview cannot compete with tauri and I can't find something bad in tauri that would make it worth to switch to something else.

Currently, I would probably recommend tauri for new applications.
And to have some nim or C code to call from the backend, it might still be possible to just write a rust application that calls nim via FFI https://stackoverflow.com/questions/59879692/how-to-call-a-nim-function-from-rust-through-c-ffi