Feature: make wireframe identifyable for other clients (wmclass hint)

[Enrico Weigelt, metux IT consult]

Hi folks,

yet another little feature: robust identification of wireframes by
external programs via wmclass hints.

Rationale: in some cases, external programs need a robust way to
identify the wireframes. X has a standard mechanism for those kind
of things: window class hints. We just need to set one.


Example use case and user request:
https://gitlab.xfce.org/xfce/xfwm4/-/issues/208

MR: https://gitlab.xfce.org/xfce/xfwm4/-/merge_requests/62


have fun,
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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info at metux.net -- +49-151-27565287