next release changelog

[cxxxr]

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[vindarel]

• breaking change for vi-mode users: lem-vi-mode:*command-keymap* was renamed to lem-vi-mode:*normal-keymap*.

• The SDL2 implementation implemented graphical-text-buffer and its drawing methods.
  This is a buffer that can mix the drawing of text in any individual font with the display of images.
  In this PR, I have refactored this mechanism so that it is a generic mechanism rather than an SDL2-specific mechanism.
  In the process, the old drawing methods were completely replaced by the new ones.

#1054

• the control_right now works and alt_right is now seen as meta. For those wanting alt_right to be Alt Gr, the fix is: "…todo…".