v15

• Remade icons using w11'ish style
• Remade icons in 32x32 for Linux compatibility (icons won't appear blurred anymore)
• Removed odd icons for better visibility
• Revert to app icon when no headset found
• Added global low battery threshold for led and notification, leading to more comprehensive UI.
• Fixed inverted dark/light icon set
• Updated tooltips (Show device name when discharging and charging)
• Various small bugfixes
• Added beep notification for supported headsets