DOC: update the entities diagrams

The recent changes were significant enough to warrant an update to the
entities diagram. It tries to be accurate, though it doesn't represent
applets.
diff --git a/doc/internals/entities.svg b/doc/internals/entities.svg
index 8911241..839bbd2 100644
--- a/doc/internals/entities.svg
+++ b/doc/internals/entities.svg
@@ -2,8 +2,8 @@
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