[FEATURE] Support for multiple blender versions to render

[rabits]

Is your feature request related to a problem? Please describe.

For now both Manager and Agent are using the same version to execute workload, as the one they running on. So that could be hard to manage a number of blender versions to render: each time you want to switch to another version - you have to restart the Agent and Manager for now.

reported by: Rony Soussan

Describe the solution you'd like

I think Agent could download (or use predownloaded) versions of blender (that could look like a list of versions on Addon UI).