Update gitignore for 4.x and add gitattributes

.gitattributes

@@ -0,0 +1,4 @@
+# Normalize EOL for all files that Git considers text files.
+* text=auto eol=lf
+
+*.hdr binary

.gitignore

@@ -1,3 +1,5 @@
+# Godot 4+ specific ignores
+.godot/
 
 # Godot-specific ignores
 .import/

file_format.sh

@@ -14,18 +14,15 @@ while IFS= read -rd '' f; do
     elif [[ "$f" == *"hdr" ]]; then
         continue
     fi
-    # Ensures that files are UTF-8 formatted.
+    # Ensure that files are UTF-8 formatted.
     recode UTF-8 "$f" 2> /dev/null
-    # Ensures that files have LF line endings.
+    # Ensure that files have LF line endings and do not contain a BOM.
     dos2unix "$f" 2> /dev/null
-    # Ensures that files do not contain a BOM.
-    sed -i '1s/^\xEF\xBB\xBF//' "$f"
-    # Ensures that files end with newline characters.
-    tail -c1 < "$f" | read -r _ || echo >> "$f";
-    # Remove trailing space characters.
-    sed -z -i 's/\x20\x0A/\x0A/g' "$f"
+    # Remove trailing space characters and ensures that files end
+    # with newline characters. -l option handles newlines conveniently.
+    perl -i -ple 's/\s*$//g' "$f"
     # Remove the character sequence "== true" if it has a leading space.
-    sed -z -i 's/\x20== true//g' "$f"
+    perl -i -pe 's/\x20== true//g' "$f"
     # We don't want to change lines around braces in godot/tscn files.
     if [[ "$f" == *"godot" ]]; then
         continue