Point cloud classification update

[selmaVH1]

fixes #8893

[DelazJ]

Thanks @selmaVH1
May I suggest to update the "extent only" screenshot (misses triangulate setting) and the "3D view" screenshot (uses the classification renderer, hence misses the percentage and size options)

[DelazJ]

Can you clip the image to the part related to "classification" settings? this will help to show the whole classes and keep coherence with the other renderers described above. Also we don't really need to show the other parameters; they hide your message and were already shown in the "extent only" section.

[DelazJ]

Considering that the number of options are growing, what do you think about 👇🏻, allowing to move details next to specific option

Suggested change

	table, the :guilabel:`Color`, the :guilabel:`Size`, the :guilabel:`Value`
	and the :guilabel:`Legend` can be modified (for the :guilabel:`Color`, the :ref:`color-selector` widget opens).
	Assigning a :guilabel:`Size` value of 0 to a category will revert it to use
	the default point size set for the layer.
	The :guilabel:`Percentage` column will show you the representation of the category
	within the layer.
	table, you can modify:
	* the :guilabel:`Color`: the :ref:`color-selector` widget opens
	* the :guilabel:`Size`: assigning a size of ``0`` to a category will revert it to use
	the default ref:`point size <pointsymbol_size>` set for the layer
	* the :guilabel:`Value`
	* the :guilabel:`Legend`
	The :guilabel:`Percentage` column will show you the representation of the category
	within the layer.

Line 419 would then require the pointsymbol_size anchor addition

[selmaVH1]

Hi @DelazJ, thanks for the review 😃 should we add the text explanation of Render as a surface here ?

[DelazJ]

Yes it should go there, and up to you if you want to add it in this PR or another. All these features belong to master only.
Note that there is some related description in the 3D properties section, and also I pulled the corresponding issue #9024 we can take information (and rendering examples?) from.

[selmaVH1]

Ok, I didn't saw this #9024 issue... I will create another PR.

[DelazJ]

Normal, I looked for the original PR and initiated the issue creation after your other message.