FelixKratz personal patches to Yabai. This fork is minutely modified to allow building on a 2015 Macbook.

• Upgrade IPC from unix sockets to mach messages
• Reduce flickering on new window
• Add rounded borders and background blur
• Allow zooming to fullscreen if previously zoomed to parent
• Allow only one child at a time to zoom to parent node
• Zoomed windows occlude windows below in the next-window-in-direction calculation
• Focus closest window on application termination