Fix Item Alias not updating Bounds

A very simple fix for item aliases.

Item Alias Scaling Hotfix

• This fixes a scaling bug with item aliases occurring on retina screen.
• Adds y_offset property to items

Default Item Aliases

• It is now possible to display default menu bar items in sketchybar (see Experimental section of the README)
• Improved Bar hiding responsiveness
• Bars can be hidden on individual displays
• Sharper text rendering
• Internal restructuring to reduce draw calls
• Rename domain config to domain bar

New item background features and scripting variables

• Item backgrounds can now be customized with a border, a corner radius and a custom height
• New scripting variables for the space component include the display id and the space id of the associated component
• Fixes a bug where components of displays that are not connected are refreshed
• Some under the hood changes for (hopefully) better performance and stability

Added customizable bar border

It is now possible to specify a border for the bar, e.g. a small 1px wide black border:

sketchybar -m batch --config border_width=1 \
                             border_color=0xff000000

Fix Window Level and some additions

• The bar is now on top of most windows by default and can be customized to even be on top of the default menu bar
• Hide and unhide commands available
• Updated default rc

Item backgrounds and under the hood improvements

• Batching is even more powerful
• Items can have colored backgrounds

Faster space scripts and picky redraw

• Items can now be "lazy"
• The bar is redrawn only when really needed
• Everything is a bit faster
• Fix an error with batch messages

Batch messages

The new batch messaging system makes everything a bit faster

Improvements to socket connection reliability and other fixes

• Fixes #36 #35 #18