pod: improve the vararg pod builder and parser

Automatically parse and build key/value when in objects without having
to prefix the key with ":"
Automatically build control/value when in sequence without the "."
prefix.
Remove the builder with key/pod, taking a reference to the stack built
temporary pods is not allowed in c++. We can use the varargs version
with the same convenient syntax.
Remove the parser "*" option, it is unused.
Improve spa_pod_builder_add_* and spa_pod_parser_get_* and make them
look similar.

pipewire-jack

@@ -1 +1 @@
-Subproject commit 16874536363649535cfdda5227e9108ec158127a
+Subproject commit c1da362a24351c8827d5b964d24ef5176e87ca95