allow OSC-52 clipboards on all terminal emulators

* The XTerm version is still checked if we detect running under XTerm.
* Actually, the XTerm implementation is broken for Unicode clipboard contents.
* Kitty supports OSC-52, but you __must__ enable read-clipboard.
  With read-clipboard-ask, there will be a timeout.
  But we cannot read without a timeout since otherwise we would hang indefinitely
  if the escape sequence turns out to not work.
* For urxvt, I have hacked an existing extension:
  https://gist.github.com/rhaberkorn/d7406420b69841ebbcab97548e38b37d
* st currently supports only setting the clipboard, but not querying it.

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