Small Model option for MacOS (v2.4)

Mac users now have the option to use a smaller speech recognition model that performs better on Inte chipset devices. This model will load by default on new Hedy installations on Intel chipset macs.

The models Hedy uses are heavily optimized for Apple GPUs, and in the MacOS app we step up the model size significantly in order to take advantage of the additional processing power that the system provides us. Older Macs with Intel chipsets need to fall back on CPU processing, which struggles with the larger models that we include in Hedy for MacOS.