[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Initial port of the B3DAccelerator plugin, plus extra Metal and rendering clean up (#382)

[maenu]

Not sure if this fits here, but if I download the latest Pharo 7 VM on macOS High Sierra, the VM seems not to start properly, resulting in a black window and:

```
2019-03-27 11:48:46.282 Pharo[1041:7933912] Pipeline state creation error: Function screenQuadFragmentShader is using language version 2.1 which is incompatible with this OS.
```

I looked into this a while ago, and there should be some flags to enable Metal 1 compatibility, then we would get at least down to El Capitan support. Adding Metal as required dependency is a non-backwards-compatible change, this should be handled with care (e.g. do we need non-metal builds, archive old non-metal builds for older OSs?).

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