* Implemented CacaDisplay.Canvas which acts the same as caca_get_canvas().

allowing for much cleaner code (at the expense of an extra dependency).

* Slightly improved the C# test program.

fixed the bindings so that they now work with the Microsoft CLR.

when meaningful, removed deprecated bindings.

+ Renamed the dlls so that the C# versions do not have the same name
      as the C DLLs on Win32. It's now "cucul-sharp.dll", mimicking GTK#.
    + Renamed namespaces: "using Cucul" instead of "using libCucul".
    + Renamed the Cucul class into CuculCanvas to avoid namespace/class
      name collisions.
    + Renamed old-fashioned "kk"/"qq" names into "dp"/"cv".