Problem:    Building with Aap is outdated and unused.
Solution:   Remove the Aap build files.

Problem:    No Danish manual translations.
Solution:   Add the Danish manual translations to the file list.

Problem:    Evim.man missing from the distribution.
Solution:   Add it to the list.

Problem:    Cannot easily run individual tests on MS-Windows.
Solution:   Move the list of tests to a separate file.  Add a build rule in
            the MSVC makefile.

Problem:    Building with MinGW does not work out-of-the-box.
Solution:   Add instructions for MSYS2.  Set default WINVER.  Add batch files
            to set $PATH for MSYS2.

Problem:    New po makefile missing from distribution.
Solution:   Add it to the file list.

Problem:    Lgtm considers tutor.es to be EcmaScript.
Solution:   Add a config file for lgtm. (Bas van Schaik, closes #2844)

Problem:    Screen dump test script not included in distribution.
Solution:   Add the script to the list of distributed files.

Problem:    Screen dumps not included in distribution.
Solution:   Add dumps to the list of distributed files.

Problem:    Color scheme check script shows up as color scheme.
Solution:   Move it to the "tools" subdirectory. (closes #2457)