Change manifest files to declare Windows GUI apps to be "DPI-aware", that is,

Change manifest files to declare Windows GUI apps to be "DPI-aware", that is,
not fazed by being displayed at other than 96DPI; testing on Vista at a range
of DPIs indicates that we cope (with the minor and inevitable exception of the
drag-list control).
This stops pixel scaling and hence fuzzy display on high-resolution displays.
(Hope this is last disastrous than my last set of manifest tweaks! --
<http://support.fogcreek.com/default.asp?copilot.6.26840.1> suggests that this
is an OK thing to do.)

git-svn-id: svn://svn.tartarus.org/sgt/putty@8661 cda61777-01e9-0310-a592-d414129be87e