Improve tile editor UI

[Nielsbishere]

• Show palette next to picture.
• Move toolbar based on aspect ratio and widget size.
• Refine self made icons by removing white background.
• Indicator for brush color.
• Indicator for brush size.
• Selection tool.
• Fill tool should be accessible.
• Square tool should be accessible.
• Circle/Ellipse tool should be made.
• Pipette tool should be made accessible.
• Copy paste.
• Brush mask.