replace auto-gen of XLS doc files and Modbus with python

scripts/force_clean.py

@@ -0,0 +1,14 @@
+
+Import("env")
+import os
+import shutil
+
+def force_clean(source, target, env):
+    """Remove build directory before building"""
+    build_dir = env.subst("$BUILD_DIR")
+    if os.path.exists(build_dir):
+        print(f"Force cleaning: {build_dir}")
+        shutil.rmtree(build_dir)
+
+# Register the callback to run before building
+env.AddPreAction("$BUILD_DIR/${PROGNAME}$PROGSUFFIX", force_clean)