wip/pharo-vm 9.0.22 NetBSD

This is the branch of the Headless VM used for Pharo. This branch has the modifications required to run Pharo in a true headless environment. The image running on the VM is responsible of handling the UI and the events.

The image includes a default implementation of the handling of UI through the use of SDL2.

For more details about the whole Pharo VM project refer to our wiki.

This is a fork of OpenSmalltalk-vm. We are doing our best to keep compatibility and contribute back, as long as it fits the objective of Pharo community.