3D armour loads fast on AMD

• Fixed a long freeze on AMD graphics cards in Minecraft 26.3 the first time a pack with 3D armour loaded: the game sat on the loading screen for over a minute. The armour shader is now built only for the armour itself, and loads in seconds.

0.2.59: 3D armour fixes

• Fixed 3D armour breaking the whole resource pack on AMD graphics cards in Minecraft 26.3 ("Resource reload failed", every texture gone). The armour shader used a GPU operation AMD's driver rejects; it now compiles everywhere.
• Fixed a false "has no boots" (or helmet, chestplate, leggings) warning every time a custom item wearing a 3D armour piece was given. The piece was always applied; only the warning was wrong.
• /rp armor wear now says plainly when a set shows only its helmet because its file has both displays: false and shaders: false, instead of claiming everyone else sees the whole set.
• The example 3D armour set in the docs now shows the defaults (displays: true, shaders: true). Copying the old example turned both off, so only the helmet was ever drawn.