Merge remote-tracking branch 'remotes/kraxel/tags/ui-20210115-pull-request' into staging

ui/gtk: refresh rate fixes.
ui/vnc: add support for desktop resize and power contol.
ui/vnc: misc bugfixes.

# gpg: Signature made Fri 15 Jan 2021 10:24:10 GMT
# gpg:                using RSA key A0328CFFB93A17A79901FE7D4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" [full]
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>" [full]
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full]
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/ui-20210115-pull-request:
  vnc: add support for extended desktop resize
  vnc: move initialization to framebuffer_update_request
  vnc: move check into vnc_cursor_define
  vnc: Fix a memleak in vnc_display_connect()
  ui: add support for remote power control to VNC server
  vnc: fix unfinalized tlscreds for VncDisplay
  ui/gtk: update monitor interval on egl displays
  ui/gtk: expose gd_monitor_update_interval
  ui/gtk: limit virtual console max update interval
  ui/gtk: rename variable window to widget
  ui/gtk: don't try to redefine SI prefixes

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>