migration.

* Center font

current canvas. This is useful to export dirty rectangles. Accordingly,
add caca_import_area_from_memory() and caca_import_area_from_file().

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.

code for clarity.

split is rendered moot by the plugin system: when enabled, binaries do
not link directly with libX11 or libGL. I hope this is a step towards
more consisteny and clarity.

* Synchronise parameter types in the C++ bindings with the C API.

* Use size_t and ssize_t where appropriate.

prototypes. As they are equivalent, this does not break the ABI.

<cucul.h> will provide the C99 types, even if libcaca has been installed.
  * Rename what's left of "common.h" to "stubs.h".
  * Remove all references to erroneous <inttypes.h> from source files.

* Fix invalid pointer/int cast (Closes #39).