Feature: If a texture recipe is found in an object's folder, have z64yartool patch it

[z64me]

This is complementary to #3. Allows storing textures as PNG's alongside an object.zobj, patching the object automatically during build. This feature will be useful when working with texture banks. It also makes retexturing ordinary objects possible without having to reconstruct them from source.

Requirements:

• recipe.txt must exist in the same folder as the object.zobj you wish to retexture
• recipe.txt must contain a reference to object.zobj
• A texture folder must exist and contain the textures you wish to inject into the object
• recipe.txt must contain a reference to the folder containing the textures