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, 34 insertions, 0 deletions

diff --git a/pieces b/pieces
deleted file mode 160000
-Subproject e1fd1a04010df93f18ff1c1d8d62ea23ce96029
diff --git a/pieces/xboard/bld25.xpm b/pieces/xboard/bld25.xpm
new file mode 100644
index 0000000..ca8d60f
--- /dev/null
+++ b/pieces/xboard/bld25.xpm
@@ -0,0 +1,34 @@
+/* XPM */
+static char *bld25[] = {
+/* columns rows colors chars-per-pixel */
+"25 25 3 1",
+"  c black s dark_piece",
+". c green s dark_square",
+"X c white s light_piece",
+/* pixels */
+".........................",
+"............ ............",
+"........... X ...........",
+"........... X ...........",
+"............ ............",
+"..........  X  ..........",
+"........  XXXXX  ........",
+"....... XXXXXXXXX .......",
+"...... XXXXX XXXXX ......",
+"...... XXXXX XXXXX ......",
+"...... XXX     XXX ......",
+"...... XXXXX XXXXX ......",
+"...... XXXXX XXXXX ......",
+"....... XXXXXXXXX .......",
+"........         ........",
+"........ XXXXXXX ........",
+"........         ........",
+"....... XXXXXXXXX .......",
+"........         ........",
+"........... X ...........",
+"..         XXX         ..",
+".. XXXXXXXXX XXXXXXXXX ..",
+"...     XX  .  XX     ...",
+"... ....  .....  .... ...",
+"........................."
+};