This fixes the path to source files in some unit tests and allows
to get rid of a few duplicate lines.

caca_wherey(), in order to match the old <conio.h> naming scheme.

their crap all over the place. There is still caca-sharp/obj
that it insists on creating (reported as Connect ID 301965).

on Win64, including the .NET projects.

play with the Windows port, there is a 90-day evaluation version
available for free on the Microsoft website.

to allow third-party applications to link with caca-sharp, and tune a
few things here and there.