1) Improve and clarify documentation:
- update, reformat, and reorder parts of CREDITS.txt
- make sure that documentation appears in doxygen docs
- add '\since 1.4.0' to documentation of new methods and functions
- remove doxygen's '\brief' where not required (we're using
JAVADOC_AUTOBRIEF = YES)
- clarify screen scaling, scaling factor, and related stuff
- add more info about backwards compatibility for X11 specific code
2) Update dependencies
The Fast Light Tool Kit is a cross-platform C++ GUI toolkit for
UNIX®/Linux® (X11 or Wayland), Microsoft® Windows®, and macOS®.
FLTK provides modern GUI functionality without bloat and
supports 3D graphics via OpenGL® and its built-in GLUT
emulation. It was originally developed by Mr. Bill Spitzak
and is currently maintained by a small group of developers
across the world with a central repository on GitHub.
https://www.fltk.org/
https://github.com/fltk/fltk/
For more information see README.txt:
https://github.com/fltk/fltk/blob/master/README.txt