Update codelldb

Add a way to checksum downloads and a little guide to updating gadgets

support/gadget_upgrade/README.md

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+# Manually updating shipped gadgets
+
+Download the gadget files manuall from their official source into this dir.
+Run `./checksum.py <list of files>` to get the checksums.
+
+Update ../../python3/vimspector/gadgets.py with the new version and the
+checksums.
+

support/gadget_upgrade/checksum.py

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+#!/usr/bin/env python3
+
+import hashlib
+import sys
+
+
+def GetChecksumSHA254( file_path ):
+  with open( file_path, 'rb' ) as existing_file:
+    return hashlib.sha256( existing_file.read() ).hexdigest()
+
+
+for arg in sys.argv[ 1: ]:
+  print( f"{ arg } = { GetChecksumSHA254( arg ) }" )