fix: all: fixes to get emacs-chess working on 30.2

- added lexical-binding headers to all source files
- replaced make-variable-buffer-local with defvar-local throughout source code
- replaced deprecated cl library with cl-lib, including replacing assert with cl-assert to emacs-chess-steps.el
- added proper headers and footers to test files when missing
- populated chess images and chess sounds directory
- fixed defcustom calling directory-files without error handling.
  xboard installation no longer required.

2 files changed, 58 insertions, 0 deletions

diff --git a/pieces b/pieces
deleted file mode 160000
-Subproject e1fd1a04010df93f18ff1c1d8d62ea23ce96029
diff --git a/pieces/xboard/kll49.xpm b/pieces/xboard/kll49.xpm
new file mode 100644
index 0000000..6a7819b
--- /dev/null
+++ b/pieces/xboard/kll49.xpm
@@ -0,0 +1,58 @@
+/* XPM */
+static char *kll49[] = {
+/* columns rows colors chars-per-pixel */
+"49 49 3 1",
+"  c black s dark_piece",
+". c gray s light_square",
+"X c white s light_piece",
+/* pixels */
+".................................................",
+".................................................",
+".................................................",
+"........................ ........................",
+"........................ ........................",
+"........................ ........................",
+".....................       .....................",
+"........................ ........................",
+"........................ ........................",
+"........................ ........................",
+"........................ ........................",
+"......................     ......................",
+"..................... XXXXX .....................",
+".................... XXXXXXX ....................",
+".................... XXXXXXX ....................",
+".................... XXXXXXX ....................",
+".........       .... XXXXXXX ....       .........",
+".......  XXXXXXX  .. XXXXXXX ..  XXXXXXX  .......",
+"...... XXXXXXXXXXX   XXXXXXX   XXXXXXXXXXX ......",
+"..... XXXXXXXXXXXXXX XXXXXXX XXXXXXXXXXXXXX .....",
+".... XXXXXXXXXXXXXXXX XXXXX XXXXXXXXXXXXXXXX ....",
+".... XXXXXXXXXXXXXXXX  XXX  XXXXXXXXXXXXXXXX ....",
+"... XXXXXXXXXXXXXXXXXX XXX XXXXXXXXXXXXXXXXXX ...",
+"... XXXXXXXXXXXXXXXXXX  X  XXXXXXXXXXXXXXXXXX ...",
+"... XXXXXXXXXXXXXXXXXXX X XXXXXXXXXXXXXXXXXXX ...",
+"... XXXXXXXXXXXXXXXXXXX X XXXXXXXXXXXXXXXXXXX ...",
+"... XXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXX ...",
+".... XXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXX ....",
+".... XXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXX ....",
+"..... XXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXX .....",
+"...... XXXXXXXXXXX             XXXXXXXXXXX ......",
+"....... XXXXXX    XXXXXXXXXXXXX    XXXXXX .......",
+"........  X   XXXXXXXXXXXXXXXXXXXXX   XX ........",
+".......... XXXXXXXXXXXXXXXXXXXXXXXXXXX  .........",
+".......... XXXXXXXXXXXXXXXXXXXXXXXXXXX ..........",
+".......... XXXXXXXXXXXXXXXXXXXXXXXXXXX ..........",
+".......... XXXXXXX             XXXXXXX ..........",
+".......... XX     XXXXXXXXXXXXX     XX ..........",
+"..........   XXXXXXXXXXXXXXXXXXXXXXX   ..........",
+".......... XXXXXXXX           XXXXXXXX ..........",
+".......... XXXX    XXXXXXXXXXX    XXXX ..........",
+".......... X   XXXXXXXXXXXXXXXXXXX   X ..........",
+"..........  XXXXXXXXXXXXXXXXXXXXXXXXX  ..........",
+"...........   XXXXXXXXXXXXXXXXXXXXX   ...........",
+"..............     XXXXXXXXXXXX    ..............",
+"...................            ..................",
+".................................................",
+".................................................",
+"................................................."
+};