Sync various changes from other repos & minor updates

tools/download_tool.py

@@ -16,7 +16,6 @@ import os
 import platform
 import shutil
 import stat
-import sys
 import urllib.request
 import zipfile
 
@@ -52,6 +51,7 @@ def wibo_url(tag):
 def compilers_url(tag):
     return f"https://files.decomp.dev/compilers_{tag}.zip"
 
+
 TOOLS = {
     "dtk": dtk_url,
     "sjiswrap": sjiswrap_url,
@@ -86,4 +86,4 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
+    main()