Add SVG cleanup utility for worldmap.svg

This commit introduces a new script, cleanup_worldmap.py, which provides a utility for cleaning and normalizing the SVG file worldmap.svg. The script performs various transformations including:

- Normalizing path tags and attributes
- Adding data-iso attributes based on a provided JSON mapping
- Pretty-printing the SVG output
- Creating a backup before overwriting the original file when using the --in-place option

The script is designed for ease of use with command-line arguments and includes error handling for XML validation.

.gitignore

@@ -43,6 +43,11 @@ Temporary Items
 *.sln
 *.sw?
 
+# Backup files
+*.bak
+*.bak.*
+*.tmp
+
 # Svelte related
 .svelte-kit/
 
@@ -56,3 +61,4 @@ Temporary Items
 # Make favicon generation script executable
 chmod +x ./scripts/generate-favicons.js
 chmod +x ./scripts/update-data.js
+chmod +x ./scripts/*