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, 49 insertions, 0 deletions

diff --git a/pieces b/pieces
deleted file mode 160000
-Subproject e1fd1a04010df93f18ff1c1d8d62ea23ce96029
diff --git a/pieces/xboard/bld40.xpm b/pieces/xboard/bld40.xpm
new file mode 100644
index 0000000..9dcec2c
--- /dev/null
+++ b/pieces/xboard/bld40.xpm
@@ -0,0 +1,49 @@
+/* XPM */
+static char *bld40[] = {
+/* columns rows colors chars-per-pixel */
+"40 40 3 1",
+"  c black s dark_piece",
+". c green s dark_square",
+"X c white s light_piece",
+/* pixels */
+"........................................",
+"...................   ..................",
+".................. XXX .................",
+".................. XXX .................",
+".................. XXX .................",
+"...................   ..................",
+"................... X ..................",
+".................. XXX .................",
+"................  XXXXX  ...............",
+"............... XXXXXXXXX ..............",
+".............. XXXXXXXXXXX .............",
+"............. XXXXXXXXXXXXX ............",
+"............ XXXXXXX XXXXXXX ...........",
+"............ XXXXXXX XXXXXXX ...........",
+"........... XXXXXXXX XXXXXXXX ..........",
+"........... XXXXX       XXXXX ..........",
+"........... XXXXXXXX XXXXXXXX ..........",
+"........... XXXXXXXX XXXXXXXX ..........",
+"........... XXXXXXXX XXXXXXXX ..........",
+"............ XXXXXXXXXXXXXXX ...........",
+"............ XXXXXXXXXXXXXXX ...........",
+"............. XXXXXXXXXXXXX ............",
+"............. XX         XX ............",
+"..............  XXXXXXXXX  .............",
+".............. XXXXXXXXXXX .............",
+"............. XXXXXXXXXXXXX ............",
+".............               ............",
+"............  XXXXXXXXXXXXX  ...........",
+"............   XXXXXXXXXXX   ...........",
+"...............           ..............",
+"................... X ..................",
+".................  XXX  ................",
+"......           XXXXXXX           .....",
+"....  XXXXXXXXXXXXXX XXXXXXXXXXXXXX  ...",
+"... XXXXXXXXXXXXXX  .  XXXXXXXXXXXXXX ..",
+".... X            .....            X ...",
+"..... ............................. ....",
+"........................................",
+"........................................",
+"........................................"
+};