Houdini: Add self publish button

[MustafaJafar]

Changelog Description

This PR allows single publishing by adding a publish button to created rop nodes in Houdini

OpenPype	Ayon

Admins are much welcomed to enable it from houdini general settings

OpenPype	Ayon

Publish Button also includes all input publish instances.
in this screen shot the alembic instance is ignored because the switch is turned off

Additional info

This PR was made to prototype Fabia's idea about publishing one instance in houdini, discord discussion

Testing notes:

1. Create multiple publish instances in houdini
2. try publishing from the button

[fabiaserra]

as I said on Discord, could we also expose a string parm called "Comment" (or a pop-up dialog after clicking Publish) where they can type the comment corresponding to that publish?

[fabiaserra]

I like it! Thanks for doing this! I will test it soon

[moonyuet]

@antirotor I think this PR is ready for review and merge

[MustafaJafar]

@antirotor I think this PR is ready for review and merge

I think we would need @iLLiCiTiT review too because I modified the publisher a little bit.

Quick recap
This PR provides a quick way to specify what nodes to publish in a "Houdini way" where we connect ROPs to each other and click publish button.

It automates the current workflow and it doesn't enable procedural workflows.
Houdini does provide me with the execution order of nodes but I cannot use this information in any way.

[antirotor]

I've tested it and the code looks good. This is one step on a path to make OP/AYON workflow in Houdini more native a procedural but even in this form, it is useful. Thanks @MustafaJafar

[iLLiCiTiT]

Moved the show and publish logic to Publisher window, which reduced public functions of the window. Also removed reset_on_show argument from host tools. The proper implementation of the functionality would be more complicated. Please re-test if still works as before.

[antirotor]

First time publish will (probably) publish stuff ok, but then it will reset the UI and the publishing report/state will be lost. Subsequent publishes are ok.

[MustafaJafar]

I tested it many times, seems to work fine.

[antirotor]

With the reset fix, it works!