* initial commit of VIA Support
* update PRODUCT (and MANUFACTURER) per VIA docs
Reference: https://caniusevia.com/docs/configuring_qmk#change-product
Updated MANUFACTURER so it matches what the PRODUCT says.
* enable Link Time Optimization per mechmerlin
* revert change to USB Product Name
* add two empty layers to via keymap
VIA keymaps need four layers in flash.
* correct the layer indexes
Start from 0, not 1.
