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/nll49.xpm b/pieces/xboard/nll49.xpm
new file mode 100644
index 0000000..3b688ff
--- /dev/null
+++ b/pieces/xboard/nll49.xpm
@@ -0,0 +1,58 @@
+/* XPM */
+static char *nll49[] = {
+/* 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 */
+".................................................",
+".................................................",
+".................................................",
+".................................................",
+"............ ........ ...........................",
+"............   ..... X ..........................",
+"............ XX .... XX .........................",
+"............ XXX .. XXX .........................",
+"............ XXXX   XXX    ......................",
+"............. XX  X XXX XXX   ...................",
+"............ XX XXXXXXXXXXXXXX  .................",
+"........... XXXXXXXXXXXXXXXXXXXX ................",
+".......... XXXXXXXXXXXXXXXXXXXXXX  ..............",
+".......... XXXXXXXXXXXXXXXXXXXXXXX  .............",
+"......... XXXXX XXXXXXXXXXXXXXXXXXX  ............",
+"......... XXX  XXXXXXXXXXXXXXXXXXXXX  ...........",
+"......... XXX XXXXXXXXXXXXXXXXXXXXXXX ...........",
+"......... XX XXXXXXXXXXXXXXXXXXXXXXXX  ..........",
+"........ XXXXXXXXXXXXXXXX XXXXXXXXXXXX  .........",
+"........ XXXXXXXXXXXXXXXX XXXXXXXXXXXX  .........",
+"........ XXXXXXXXXXXXXXXX XXXXXXXXXXXXX  ........",
+"....... XXXXXXXXXXXXXXXXX XXXXXXXXXXXXX  ........",
+"....... XXXXXXXXXXXXXXXX XXXXXXXXXXXXXXX ........",
+"...... XXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXX  .......",
+"..... XXXXXXXXXXXXXXXXX . XXXXXXXXXXXXXX  .......",
+"..... XXXXXXXXXXXXXXXX .. XXXXXXXXXXXXXXX .......",
+".... XXXXXXXXXXXXXXX  ... XXXXXXXXXXXXXXX  ......",
+".... XXXXXXXXXXXXXX ..... XXXXXXXXXXXXXXX  ......",
+"... XX  XXXXXXXXX  ...... XXXXXXXXXXXXXXX  ......",
+"... XX XXXXXXXXX ....... XXXXXXXXXXXXXXXXX ......",
+"... XXXXXXXXXXX ........ XXXXXXXXXXXXXXXXX  .....",
+"... XXXXXX XXX ........ XXXXXXXXXXXXXXXXXX  .....",
+"... XXXXX XXX ........ XXXXXXXXXXXXXXXXXXX  .....",
+".... XXXX XX ........ XXXXXXXXXXXXXXXXXXXX  .....",
+".....     X ........ XXXXXXXXXXXXXXXXXXXXX  .....",
+"..........  ....... XXXXXXXXXXXXXXXXXXXXXXX .....",
+".................. XXXXXXXXXXXXXXXXXXXXXXXX  ....",
+".................. XXXXXXXXXXXXXXXXXXXXXXXX  ....",
+"................. XXXXXXXXXXXXXXXXXXXXXXXXX  ....",
+"................ XXXXXXXXXXXXXXXXXXXXXXXXXX  ....",
+"............... XXXXXXXXXXXXXXXXXXXXXXXXXXX  ....",
+"............... XXXXXXXXXXXXXXXXXXXXXXXXXXX  ....",
+".............. XXXXXXXXXXXXXXXXXXXXXXXXXXXX  ....",
+".............. XXXXXXXXXXXXXXXXXXXXXXXXXXXX  ....",
+".............. XXXXXXXXXXXXXXXXXXXXXXXXXXXX  ....",
+"..............                              .....",
+".................................................",
+".................................................",
+"................................................."
+};