[3.13] Further revise idlelib/Icons/README.text (GH-123364) (#123608)

* Further revise idlelib/Icons/README.text (GH-123364)

In particular, add trademark derivative approval information.
(cherry picked from commit fe85a8291d)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

* Update Lib/idlelib/Icons/README.txt

---------

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
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@ -1,16 +1,23 @@
2006?: Andrew Clover made the 16-, 32-, and 48-bit icons for win23.
https://www.doxdesk.com/software/py/pyicons.html
(TJR: Not sure if this originally included 256-bit image.)
IDLE-PYTHON LOGOS
2006: They were copied to CPython as Python application icons.
These are sent to tk on Windows, *NIX, and non-Aqua macOS
in pyshell following "# set application icon".
2006?: Andrew Clover made variously sized python icons for win23.
https://www.doxdesk.com/software/py/pyicons.html
2006: 16, 32, and 48 bit .png versions were copied to CPython
as Python application icons, maybe in PC/icons/py.ico.
https://github.com/python/cpython/issues/43372
(TJR: I do not remember where put in CPython source tree.)
2014: They were copied (perhaps a bit revised) to idlelib/Icons.
https://github.com/python/cpython/issues/64605
.gif versions were also added.
2020: Add Clover's 256-bit image.
https://github.com/python/cpython/issues/82620
Other fixups were done.
The idle.ico file used for Windows was created with ImageMagick:
$ convert idle_16.png idle_32.png idle_48.png idle_256.png idle.ico
@ -19,18 +26,26 @@ The idle.ico file used for Windows was created with ImageMagick:
Issue added Windows Store PC/icons/idlex44.png and .../idlex150.png.
https://github.com/python/cpython/pull/22817
** These should also be updated with major changes.
?? Should these be updated with major changes?
2022: Optimize .png images in CPython repository.
2022: Optimize .png images in CPython repository with external program.
https://github.com/python/cpython/pull/21348
idle.ico (and idlex##) were not updated.
The idlexx.gif files are only needed for *nix running tcl/tk 8.5.
As of 2022, this was known true for 1 'major' Linux distribution.
(Same would be true for any non-Aqua macOS with 8.5, but must be none.)
(Same would be true for any non-Aqua macOS with 8.5, but now none?)
Can be deleted when we require 8.6 or it is known always used.
The other .gifs are used by browsers using idlelib.tree. At least some
will not be used when tree is replaced by ttk.Treeview.
Future: Derivatives of Python logo should be submitted for approval.
PSF Trademark Working Group / Committee psf-trademarks@python.org
https://www.python.org/community/logos/ # Original files
https://www.python.org/psf/trademarks-faq/
https://www.python.org/psf/trademarks/ # Usage.
Edited 2024 August 25 by TJR.
OTHER GIFS: These are used by browsers using idlelib.tree.
At least some will not be used when tree is replaced by ttk.Treeview.
Edited 2024 August 26 by TJR.