Tcod

Fixed
- Fixed header declaration for `TCOD_sys_accumulate_console`.

Added
- Added new functions which convert from SDL events to libtcod events:
- `TCOD_sys_process_key_event`
- `TCOD_sys_process_mouse_event`
- `tcod::sdl2::process_event`
- Added a way to access libtcod's SDL variables.
- `TCOD_sys_get_sdl_window`
- `TCOD_sys_get_sdl_renderer`
- Added `TCOD_sys_accumulate_console` which renders a console to the display
without automatically presenting it.
- The new renderers can potentially use a fall-back font when none is provided.

Fixed
- `TCOD_console_has_mouse_focus` and `TCOD_console_is_active` are now more
reliable with the newer renderers.

Deprecated
- Updated libtcodpy deprecation warning with instructions on how to update to
python-tcod.

Changed
- GCC releases now include debug symbols.
Fixed
- `SDL2` and `OPENGL2` now support screenshots.
- `TCOD_sys_get_char_size` fixed on the newer renderers.

Changed
- Printing generates more compact layouts.
Fixed
- Fixed segmentation faults in the newer print functions caused by bad color
codes.
- The `OPENGL` and `GLSL` renders work again in static builds.
- The `SDL2` and `OPENGL2` renders can now large numbers of tiles.

Changed
- The SDL2/OPENGL2 renderers will now auto-detect a custom fonts key-color.
Fixed
- `TCOD_console_printf_frame` was clearing tiles outside if it's bounds.
- The `TCOD_FONT_LAYOUT_CP437` layout was incorrect.