Corne case modified for larger battery & choc switches

Based on Void's corne case. 

• Modified to fit 750mah battery vertically and 1200mah horizontally. I used a LP-503562 with 1200mAh in the end. Battery should not be taller than 5mm.
• Increased PCB height slightly to make space for kailh hotswap sockets.
• Decreased outer frame to better fit kailh chocs.
• Outer frame slightly adjusted for better screen protection.

Adjusted left side only, mirror for right side.