Add HAPI input curves - helper functions that can allow you to create input curves more easily

• Updated example scenes.
• Documentation update
• Added #if UNITY_EDITOR preprocessor to a UI function
• Added project curves to scene view direction to make projecting curves more UX friendly.
• Additionally, restarted pipe sessions will now create a pipe session instead of a socket one
• Added some error checking with shelves
• Additionally, fixed an issue where the Add selection menu wouldn't update when cooking is set to false.
• Miscellaneous bug fixes regarding errors and UI.
• Fixed minor undo error log

(Windows Only) Fixed an issue that uninstalling launcher reported error "Failed to unknown unknown".

The Copy Inputs to Outputs parm on the Python Script TOP now has a third option to copy input files if the script itself does not add any outputs.

Fixed a potential crash in the Bullet solver when an object contained empty geometry.

Adding hou.logging module to control Houdini's new universal logging framework.

Fixed the Render Gallery pane so that it creates a backend database that is accessible by users other than the gallery's creator.

Added the ability to move points in draw mode with MMB to Curve::2.0 SOP, and fixed a bug that could result in degenerate curves when deleting all points except a rounded corner in a closed curve.

Updated help for the Edit SOP's Transform Space parameter.

ragdollconstraints and ragdollsolver now take packed geometry as Collision Geometry, not only rbd packed geometry Fixed the Object and Speed based ragdoll transitions, they should as expected now

Fixed a bug where calling pdg.WorkItem.inputResultDataForTag on an out-of- process work item would throw an exception, if there were no input files. It now returns the empty list, to match the behavior of in-process work items.

Improved "Choose a Version to Install" dialog to mark those versions if they are already installed.

Improved the big orange "Install PRODUCT" button to automatically switch to "Modify PRODUCT" when current product had already been installed and only one current product is allowed per machine.

Fixed a bug where Python Panel interfaces sometimes opened in standalone windows if the pane tabs that contained them were opened in floating windows.

Fixed issues with the hou.qt.ParmDialog() HOM class popping out of position in the widget layout.

Fixed MaterialX Standard_surface shader outputting wrong colours when metalness parameter is non-zero.

Fixed a bug in file rename top node, renaming happens now during cook instead of generate.

Fixed a bug where errors raised during execution of event callback scripts could be picked up as node synchronization errors during a "Match Current Definition" operation.

Fixed an issue where defining custom node info templates could cause the TOPs node info window to break.

Converted Karma-specific API schemas for extending lights, cameras, and geometry primitives to be "codeless" schemas. This means they have no C++ or python APIs, but it also means that they can be used with other USD libraries without having to compile any code.

Added a preference to control whether or not the viewport is allowed to load and display payloads that have been explicitly excluded from loading by a Configure Stage LOP.

Added the ability to use python to construct "post-layers" on a LOP Network. These are USD layers that are stronger than any LOP-authored layers, and which are composed onto the viewport stage, and the LOP authored stage viewed in the scene graph tree and output by the USD and USD Render ROPs.

Fixed include/accessibility issues with the C++ Public API.

The Volume Trail SOP is now verbified.

Color parameters can now be set from the MaxScript API.