Metal material overhaul

[SirFancyBacon]

Overhauls metallic objects to make them look a bit more like metal!

Features:

• New normal map to help the light scattering effect.
• Reworked specularity and gloss for metallic textures.
• Reworked UVs for metallic objects.
• Add additional metallic objects.
• Renames metallic_2 to be correctly named metallic_1_light

Screens:

[SirFancyBacon]

I am sure there will be more to come as i discover other metallic objects; But this should be ready for testing if nothing else

[SirFancyBacon]

Should have fixed the issues and brought inline with master