Deprecate PackedDataContainer

A custom resource type, or the methods suggested in the
deprecation message are easier to use and work more reliably.

doc/classes/PackedDataContainer.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="PackedDataContainer" inherits="Resource" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="PackedDataContainer" inherits="Resource" deprecated="Use [method @GlobalScope.var_to_bytes] or [method FileAccess.store_var] instead. To enable data compression, use [method PackedByteArray.compress] or [method FileAccess.open_compressed]." xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		Efficiently packs and serializes [Array] or [Dictionary].
 	</brief_description>

doc/classes/PackedDataContainerRef.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="PackedDataContainerRef" inherits="RefCounted" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="PackedDataContainerRef" inherits="RefCounted" deprecated="Use [method @GlobalScope.var_to_bytes] or [method FileAccess.store_var] instead. To enable data compression, use [method PackedByteArray.compress] or [method FileAccess.open_compressed]." xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		An internal class used by [PackedDataContainer] to pack nested arrays and dictionaries.
 	</brief_description>