Stable-1.2

What was changed

• Default to layer-shell protocol when available
• Fixed gaps between buttons looking bad
• Added support for multiple monitors
• Added ability to display key binds of buttons
• Recognize -C as an alias of --css by @CodeLongAndProsper90 in #25
• Set layer shell namespace properly by @latipun7 in #30
• App closes when background is clicked by @LinusDikomey in #37
• Corrected typos in man page by @b1rger in #11 and #10
• Fixed missing tab by @Artturin in #40