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, 63 insertions, 0 deletions

diff --git a/pieces b/pieces
deleted file mode 160000
-Subproject e1fd1a04010df93f18ff1c1d8d62ea23ce96029
diff --git a/pieces/xboard/nll54.xpm b/pieces/xboard/nll54.xpm
new file mode 100644
index 0000000..186c270
--- /dev/null
+++ b/pieces/xboard/nll54.xpm
@@ -0,0 +1,63 @@
+/* XPM */
+static char *nll54[] = {
+/* columns rows colors chars-per-pixel */
+"54 54 3 1",
+"  c black s dark_piece",
+". c gray s light_square",
+"X c white s light_piece",
+/* pixels */
+"......................................................",
+"......................................................",
+"......................................................",
+"......................................................",
+"..............   .......  ............................",
+"..............    .....    ...........................",
+"..............     ....     ..........................",
+"..............  X   ..   X  ..........................",
+"..............   X      XX  . ........................",
+"...............  XX     XX       .....................",
+"...............  X      XX  XX      ..................",
+"..............      XXXXXX  XXXXX     ................",
+".............   X  XXXXXXXXXXXXXXXX    ...............",
+"............   XXXXXXXXXXXXXXXXXXXXX    ..............",
+"............  XXXXXXXXXXXXXXXXXXXXXXX    .............",
+"...........   XX    XXXXXXXXXXXXXXXXXX    ............",
+"...........  XX    XXXXXXXXXXXXXXXXXXX     ...........",
+"...........  XX    XXXXXXXXXXXXXXXXXXXX    ...........",
+"...........  XX   XXXXXXXXXXXXXXXXXXXXXX    ..........",
+"...........  XX XXXXXXXXXXXX  XXXXXXXXXX     .........",
+"..........   XXXXXXXXXXXXXXX  XXXXXXXXXXX    .........",
+"..........  XXXXXXXXXXXXXXXX  XXXXXXXXXXX     ........",
+".........   XXXXXXXXXXXXXXXX  XXXXXXXXXXXX    ........",
+"........   XXXXXXXXXXXXXXXX   XXXXXXXXXXXX    ........",
+"........  XXXXXXXXXXXXXXXXX  XXXXXXXXXXXXXX    .......",
+".......   XXXXXXXXXXXXXXXX    XXXXXXXXXXXXX    .......",
+".......  XXXXXXXXXXXXXXXX     XXXXXXXXXXXXX    .......",
+"......   XXXXXXXXXXXXXX    .  XXXXXXXXXXXXXX    ......",
+"......  XXXXXXXXXXXXX    ...  XXXXXXXXXXXXXX    ......",
+".....   X  XXXXXXXX    .....  XXXXXXXXXXXXXX    ......",
+".....  X   XXXXXXX   ......   XXXXXXXXXXXXXX    ......",
+".....  X   XXXXXX   .......  XXXXXXXXXXXXXXX     .....",
+".....  X  XX  XX   .......   XXXXXXXXXXXXXXXX    .....",
+".....  XXXXX  X   .......   XXXXXXXXXXXXXXXXX    .....",
+".....   XXX      ........  XXXXXXXXXXXXXXXXXX    .....",
+"......       X  ........   XXXXXXXXXXXXXXXXXX    .....",
+"........        .......   XXXXXXXXXXXXXXXXXXX    .....",
+"............   .......   XXXXXXXXXXXXXXXXXXXX     ....",
+".....................   XXXXXXXXXXXXXXXXXXXXXX    ....",
+"....................   XXXXXXXXXXXXXXXXXXXXXXX    ....",
+"...................   XXXXXXXXXXXXXXXXXXXXXXXX    ....",
+"...................  XXXXXXXXXXXXXXXXXXXXXXXXX    ....",
+"..................   XXXXXXXXXXXXXXXXXXXXXXXXX    ....",
+"..................  XXXXXXXXXXXXXXXXXXXXXXXXXX    ....",
+".................   XXXXXXXXXXXXXXXXXXXXXXXXXX    ....",
+".................  XXXXXXXXXXXXXXXXXXXXXXXXXXX    ....",
+".................  XXXXXXXXXXXXXXXXXXXXXXXXXXX    ....",
+".................                                 ....",
+".................                                .....",
+"......................................................",
+"......................................................",
+"......................................................",
+"......................................................",
+"......................................................"
+};