Fixes: #52 (CVE-2021-3410)

sprintf_s uses that function and VS2010 does not strip it off even if it
is unused. Also do not use 64-bit integer division in the timer code because
that will create unwanted references to ___moddi3 and ___divdi3.

provide the deprecated snprintf(). The mingw32 runtime does not provide the
MS-specific sprintf_s(). Mingw-w64 copes with both. So we switch to sprintf_s
but also provide it as a weak symbol so that mingw32 does not complain.

Fixes #41.

speedups when the calling application knows the dirty rectangle covered by
a complex operation.

one dirty rectangle, but this is the first step to improvement.

a more natural (x,y,w,h) 4-tuple to handle.

currently dirty rectangles.

inner implementation still only handles one dirty rectangle, but this way
we can prepare supporting applictions for the future.

lesson to you: unit tests are good.

that anything outside the dirty rectangle is guaranteed to be unchanged, but
we currently mark far too many cells as dirty. This must be optimised.

Dirty rectangles are an upcoming optimisation that will tell the output
drivers which portion of the canvas has been really modified since the
last blit.

are almost there.

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.

far better for error checking.

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.

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fewer than Firefox, lol.

accordingly.
  * The C++ test example no longer needs "config.h".

direct cv->chars and cv->attrs access by display drivers.

drivers no longer need to access the cv->refcount private member
    and __cucul_set_canvas_size() is no longer needed.

collisions due to symbol mangling.

* Renamed cucul_*_canvas_frame() to cucul_*_frame() because we bloody well
    know that a frame belongs to a canvas.

to be ignored.

* More debugging information in the import/export and font functions.

* Partial update of the C++ bindings.
  * Updated documentation.

cucul_set_color() and cucul_set_truecolor() under the new names
    cucul_set_color_ansi() and cucul_set_color_argb().
  * Renamed cucul_get_color_name() into cucul_ansi_to_str().

functionality into cucul_set_attr().
  * Add cucul_ansi_to_attr() and cucul_argb_to_attr().
  * Rename CUCUL_COLOR_* to CUCUL_*.