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, 42 insertions, 0 deletions

diff --git a/pieces b/pieces
deleted file mode 160000
-Subproject e1fd1a04010df93f18ff1c1d8d62ea23ce96029
diff --git a/pieces/xboard/bll33.xpm b/pieces/xboard/bll33.xpm
new file mode 100644
index 0000000..e540d21
--- /dev/null
+++ b/pieces/xboard/bll33.xpm
@@ -0,0 +1,42 @@
+/* XPM */
+static char *bll33[] = {
+/* columns rows colors chars-per-pixel */
+"33 33 3 1",
+"  c black s dark_piece",
+". c gray s light_square",
+"X c white s light_piece",
+/* pixels */
+".................................",
+".................................",
+"...............   ...............",
+".............. XXX ..............",
+".............. XXX ..............",
+"...............   ...............",
+"............... X ...............",
+".............  XXX  .............",
+"............ XXXXXXX ............",
+"........... XXXXXXXXX ...........",
+".......... XXXXX XXXXX ..........",
+".......... XXXXX XXXXX ..........",
+"......... XXXXXX XXXXXX .........",
+"......... XXXX     XXXX .........",
+"......... XXXXXX XXXXXX .........",
+"......... XXXXXX XXXXXX .........",
+"......... XXXXXXXXXXXXX .........",
+".......... XXXXXXXXXXX ..........",
+".......... XXXXXXXXXXX ..........",
+"...........           ...........",
+"........... XXXXXXXXX ...........",
+".......... X         X ..........",
+"..........  XXXXXXXXX  ..........",
+".......... XXXXXXXXXXX ..........",
+"...........           ...........",
+"..............  X  ..............",
+"....          XXXXX          ....",
+"... XXXXXXXXXXXX XXXXXXXXXXXX ...",
+"... XXXXXXXXXX  .  XXXXXXXXXX ...",
+"....          .....          ....",
+".... ....................... ....",
+".................................",
+"................................."
+};