Up version to v2.5.1

Fix tag mismatches between WebUI C and go-webui

where one is using `v` prefix `v<x.x.x>` and the other not `<x.x.x>`

Keep SetProxy as comment until it is part of a release version

Fix `setup.sh`

Support multiple go-webui versions with their own WebUI C version in …

…GOPATH

Format `setup.ps1` with powershell-editor-services

Prepare project for release, remove static build files