spook's tweaks

Psora's Tweaks v1.7.1 for 25w41a & 25w42a

Changes since v1.7.0:

• Added new textures for all spear variants for their materials to match other items in pack and remove random orange handles (literally why are they even there)
• Added new item and model textures for nautilus armor shells to match other items' color palettes
• Tweaked coloration of copper sword, pickaxe, axe, shovel, and hoe
• Edited nautilus saddle texture to match pack's other brown saddles