Proposed backports to 1.9.x branch

Hi Stefan,

I propose to back the following changes to TortoiseSVN 1.9.x branch:
* r27068-27070,27072-27074
  Do not wait for TSVNCache.exe when it's disabled. This saves about
100ms before every operation when status cache is disabled.

* r27071,r27077
  Obtain HEAD revision before Update operation using separate request
to the server only we have PreUpdateHook configured.

  This could save up to 500ms for the common case, because
establishing new connection to the server may take a while over high
latency network, especially if https and authentication is involved.

* r27787
  Manifest TortoiseBlame and TortoiseUDiff as DPI-aware. TortoiseMerge
and TortoiseProc are already manifested as DPI-aware.

* r27797, r27800
  Fix drawing icons in CFilterEdit that used to filter history and log
messages on High-DPI displays.

All changes merge without conflicts. What do you think?

-- 
Ivan Zhakov
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