appveyor.yml: add integration with AppVeyor CI

Many dependencies (Git, MSVC2015, etc.) are already installed. The only
missing ones are HTMLHelp and Doxygen, but these are not used.

The AppVeyor free plan has one concurrent job with 2 cores, starting
with the first item in the test matrix. As everyone likely develops on
64-bit, 32-bit is more likely to break, thus prioritize it for VS2015.
For testing artifacts, do create a VS2017 x64 build before that though.

Cloning git and installing deps takes about 2-3 minutes. cmake takes
2-3 minutes. Wireshark.sln and test-programs build in about 11-12
minutes, tests run in about 3 minutes, nsis packages in 3-4 minutes.
A single job takes 21-28 minutes (depending on environment).

Change-Id: If0c738743ce3ccd7ddfb5d9e77cdb2d3a5354ac7
Reviewed-on: https://code.wireshark.org/review/28967
Reviewed-by: Dario Lombardo <lomato@gmail.com>
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot
Reviewed-by: Peter Wu <peter@lekensteyn.nl>

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