Block Outline 1.1.0

• Completely refreshed the /outline GUI with the new MrGreenGames dark/mint visual style.
• Added a new Rainbow outline mode.
• Added a dedicated Rainbow Range screen with selectable Start and End hues.
• Rainbow mode now smoothly cycles only through the selected hue range.
• Added 5 Rainbow animation speed presets, with speed changes previewing immediately while the menu is open.
• Restricted custom outline targeting to the player's normal interaction reach instead of allowing the old 8-block selection range.
• Reworked outline rendering so smaller thicknesses sit further inside the block perimeter, helping shared block edges remain visible.
• Larger thickness settings retain a small controlled outward bleed for a heavier look.
• Reduced outline trailing so the highlight follows fast target changes more closely.