[romangolev]

Review PR for the pythonnet changes behind pyrevitlabs/pyRevit#3846 (pyrevit.forms under CPython).

pyRevit 7.0.1 pins this fork at f591d92 (the base branch, pyrevit-7). pyrevitlabs/pyRevit#3846 moves the dev/modules/pyRevitLabs.Python.Net submodule to 173f533 and updates the PythonNet DLLs in dev/libs. These 13 commits were pushed straight to pyrevit-5-main, which already contains them; this PR exists so they can be reviewed and linked from pyrevitlabs/pyRevit#3846.

Changes

Derived CLR types

• Generated subclass types are cached, keyed on their explicit CLR members and full shape, so redefining a Python class (script reloads) reuses a matching type instead of failing; derived types keep their names.
• Interface-only Python classes get a derived managed type and no longer need __namespace__; interface types are keyed by defining file.
• Inherited interface members are implemented on derived types.
• Class-creation hooks (__set_name__, __init_subclass__) run for derived types.

Conversions

• Python truthiness converts to bool targets.
• Python object maps to System.Object as a generic argument.
• Disposable CLR objects work as context managers (with).

Codecs

• Codecs registered after the first conversion take effect.
• Codecs are queried outside the registry lock.

Tests

• CLR class redefinition is covered, with a fixture for it.