SG-40163 Make FPTR menu work for Houdini version 21.0+

[julien-lang]

This pull request refactors the Houdini menu XML generation logic to improve modularity and maintainability.
The main goal is to be able to use the class out of an engine context since we need to call it in startup.py starting with Houdini 21.0+

Based on #89

[Copilot]

Pull Request Overview

This PR adds support for Houdini version 21.0+ by refactoring menu creation and removing version-specific checks throughout the codebase. The main changes include creating a new engine-agnostic MenuBuilder class for menu XML generation and cleaning up legacy version compatibility code.

Key Changes:

• Extracted menu creation logic into a dedicated MenuBuilder class for Houdini 21.0+ compatibility
• Removed version-specific checks and legacy code for older Houdini versions
• Updated import structure to expose the new MenuBuilder class
• Removed unused Python packages (urllib2.py, httplib.py, LICENSE)

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
startup.py	Added menu creation logic for Houdini 21.0+ using new MenuBuilder class
python/tk_houdini/ui_generation.py	Refactored menu code into MenuBuilder class, removed legacy menu methods
python/tk_houdini/init.py	Added MenuBuilder import to expose the class
python/packages/*.py	Removed unused Python 2 compatibility packages
engine.py	Removed version-specific checks and legacy compatibility code

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[Copilot]

The TODO comment indicates this is only for Houdini 21.0+, but there's no version check in the code. Either add the version check or update the comment to reflect the actual implementation.

Suggested change

	# TODO - only for Houdini version 21.0+
	enable_sg_menu = self.get_setting("enable_sg_menu", True)
	if enable_sg_menu:
	# Only enable SG menu for Houdini version 21.0+
	enable_sg_menu = self.get_setting("enable_sg_menu", True)
	if enable_sg_menu and self.version.version_tuple[0] >= 21:

[julien-lang]

TODO replace that by inspect.getsource(test)

[Copilot]

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