Results 4 issues of p2or

Install instructions proposal (formatting, linux, manual link to `houdini.env`, forward slashes on windows, optional use of provided environment file)

Hi, this *Pull Request* updates the Addon for 2.8x and solves issue #10. - OpenGL progress bar for 2.8x - Registration and properties (annotations, naming) according to release notes -...

Blender 2.8x allows creating [Custom Manipulators](https://devtalk.blender.org/t/linking-custom-manipulators/1140) for the viewport so both _Near_ and _Far Limit_ shapes could be replaced with real handles (two arrows pointing in the opposite direction), allowing...

enhancement

This patch basically allows to override the render settings per item (scene, camera and render template) in the render queue and keeps the UI compact and clean. ![ezgif-7-9a9290f9b7](https://github.com/user-attachments/assets/8e98cabd-d505-4bde-8afe-1ce6d696fd6d)