Problem:    The Athena GUI support is outdated.
Solution:   Remove the Athena GUI code.

Problem:    MS-Windows: the installed icon is low resolution.
Solution:   Use a better icon.  Install vim.ico. (Christian Brabandt,
            closes #9931, closes #9930)

Problem:    The find_tags_in_file() function is much too long.
Solution:   Refactor into multiple smaller functions. (Yegappan Lakshmanan,
            closes #9892)

Problem:    Old mac resources files are no longer used.
Solution:   Delete the unused files. (Ozaki Kiichi, closes #9688)

Problem:    Generating nv_cmdidxs.h requires building Vim twice.
Solution:   Move the table into a separate file and use a separate executable
            to extract the command characters. (Ozaki Kiichi, closes #9669)

Problem:    Generating the normal command table at runtime is inefficient.
Solution:   Generate the table with a Vim script and put it in a header file.
            (Yegappan Lakshmanan, closes #9648)

Problem:    Too much code for supporting old MSVC versions.
Solution:   Remove MSVC 2003 support. (Ken Takata, closes #9623)

Problem:    MS-Windows: Global IME is no longer supported.
Solution:   Remove the Global IME implementation. (Ken Takata, closes #9562)

Problem:    CodeQL reports problem in if_cscope causing it to fail.
Solution:   Use execvp() instead of execl().  Merge the header file into the
            source file. (Ozaki Kiichi, closes #9519)

Problem:    List of distributed files is outdated.
Solution:   Add new files.