Josh's 4x12 layout

Notable features:

• Esc is Ctrl on hold
• Left space is MOD_HYPER on hold
• Backspace is still backspace on RAISE and LOWER
• Faux clicky controls are on the arrow keys on the ADJUST layer, and the backlight controls are directly above that
• Backlight breathing is disabled; backlight flickering is implemented instead
• Colemak and other layouts are thoroughly disabled
• Rotary encoder controls media volume on base layer

This layout has been tested on:

• Let's Split (rev 2)
• Let's Split Vitamins Included (rev 1)
• Planck (rev 4)

It builds for the Planck rev 6 but has not been tested yet.