Let an item handle stand in for its sockets (520.32.1)

[BradyAJohnston]

Patch release 520.32.1.

An Item handle now stands in for its sockets:

pos = g.Position() >> cap.items.vector()        # into .input, continues from .output
g.SetPosition(offset=cap.items.float(0.5))      # as a value: .output
sep.items.float("Spacing") >> g.Math.add(1.0)   # left of >>: .output

• One-sided items raise for the side they lack: a Separate Bundle item has only an output, a Combine Bundle item only an input.
• Zone state items keep asking for initial, current, next or result, since they have two inputs and two outputs; the handle itself raises with that list. For-each items, main_items and generated_items are ordinary two-role items and get the behaviour.
• This restores code that fed a Separate Bundle item straight into a node, which 520.32.0 broke by returning handles (squishy_volumes does this). Explicit .output keeps working.

Typed through an __rshift__ overload so node >> item is the item's output socket class.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.34%. Comparing base (783b4f6) to head (e59d662).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #241   +/-   ##
=======================================
  Coverage   98.34%   98.34%           
=======================================
  Files         101      101           
  Lines       30252    30277   +25     
=======================================
+ Hits        29752    29777   +25     
  Misses        500      500           

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