now x/y/width/height instead of x1/y1/x2/y2. Avoids unnecessary +1/-1
    computations.

values between 0 and 9 (used to be 0 and 10). Updated documentation
    accordingly.

choose the background colour.

their name, eg. cucul_create() -> cucul_create_canvas() etc.
  * Moved buffer-related functions to cucul/buffer.c.

* Renamed canvas handle variables from "c" to "cv". Eh ouais mon gros.

same and they're very short (50-100 lines).

compilation warnings.

cucul.c just in case.

* Added cucul_set_truecolor() for non-ANSI colours.
  * Added new argb32 -> rgb12 conversion functions.

such as cucul_dither_t instead of struct cucul_dither.
  * Made cucul_buffer_t an opaque structure and implemented the two getters
    cucul_get_buffer_data() and cucul_get_buffer_size().
  * Documented all missing functions and function parameters.

remove redundencies in the Doxygen documentation.

secure against broken files, but it probably needs peer review.

* Fixed font selection through cucul_font_load().
  * Added a bigger 10x19 bold font.

* Removed ugly hooks from test/font.c.

* Documented most font functions.
  * Cleaned up cucul_render_canvas() and made it actually usable by external
    programs. Removed ugly printf() debug calls.

* Replaced the 8-bit internal font with a 4-bit one.

fg/bg value into its separate argb 4-bit fields.

for the moment.

skeleton for the renderer that will not last very long.

format proposal is in this file. Feel free to comment.

* Removed '\x0f' from the IRC exporter until I understand why it was here.

really portable, and Visual Studio complains when they are not explicitely
    cast.

* Fixed exporter headers to make Doxygen happy.