Tcod

Added
- Added new C print functions: ``TCOD_printf_rgb``, ``TCOD_printn_rgb``, and ``TCOD_vprintf_rgb``.
[133](https://github.com/libtcod/libtcod/pull/133)
- Added a default constructor for ``TCODImage``.

Fixed
- Functions getting the size of an image now handle null pointers consistently.
- Will no longer try to include ``<utf8proc.h>`` when Unicode support is disabled.

Added
- Libtcod can now be built without utf8proc by passing the `-LIBTCOD_UTF8PROC=disable` flag to CMake.

Fixed
- Fixed double present bug in non-context flush functions.
This was affecting performance and also caused a screen flicker whenever the global fade color was active.

Fixed
- Libtcod was not linking `utf8proc` correctly in projects statically built with CMake.

Fixed
- Fix regression in TCODList when items are removed during iteration.

Added
- Libtcod can now be built without zlib by passing the `-DLIBTCOD_ZLIB=disable` flag to CMake or by setting `CMAKE_DISABLE_FIND_PACKAGE_ZLIB=1`.
- Libtcod can now be built without PNG support by passing the `-DLIBTCOD_LODEPNG=disable` flag to CMake.
- Added context screen capture functions to take screenshots into memory instead of a file.

Changed
- The OpenGL2 renderer now defaults to the nearest filter unless `SDL_HINT_RENDER_SCALE_QUALITY` is set otherwise.
This makes the renderer consistent with the SDL2 renderer.
- Parser function parameters are more const correct.

Fixed
- SDL2 console rendering is no longer likely to stack overflow.
- Fixed regression where new keywords would prevent older config files from loading.
- Exceptions were not correctly thrown on errors when reading colors from streams.

Added
- Added the `tcod::Context` class to better handle contexts in C++.
- Added a CMake toggle `LIBTCOD_THREADS` to remove deprecated threading functions.
`CMAKE_DISABLE_FIND_PACKAGE_Threads=1` can also be used.
- Libtcod can now be built without SDL by passing the `-DLIBTCOD_SDL2=disable` flag in CMake or by setting
`CMAKE_DISABLE_FIND_PACKAGE_SDL2=1`.

Changed
- SDL-based accumulate functions can now handle a non-window render target.
- The SDL2 renderer has been rewritten to use `SDL_RenderGeometry` when compiled with SDL 2.0.18.
[104](https://github.com/libtcod/libtcod/issues/104)
- C++ inline functions switched to use C++17 filesystem types.
- Error messages are no longer thread-local.
- C++ objects have been moved to their `.hpp` headers:
`tcod::ColorRGB`, `tcod::ColorRGBA`, `tcod::BresenhamLine`, REXPaint functions.

Deprecated
- Older REXPaint functions using `TCOD_list_t` have been deprecated.
- C++ methods gotten through TCOD_Context have been moved to a specialized class.
Replace ``tcod.new_context(params)`` with ``tcod::Console(params)``.

Fixed
- Fixed poor attribute handing causing compile errors in GCC 12.
[116](https://github.com/libtcod/libtcod/issues/116)
- Context screenshots no longer crash when given NULL which the API implied was possible.