Loot Beams Retro

A big thank you to jbredwards for the large PR!

Features:

• Config now supports Metadata:
  • Metadata may be optionally specified, using the format "item:metadata=color"
    • For example, "minecraft:wool:5=color" applies the beam color only to lime wool
    • Note: modid is needed when specifying metadata (meaning that "wool:5=color" will not work)
• Config now supports greatly expanded Color reading:
  • Add the ability to read color alpha
  • Add the ability to read color from dye name (red, light_blue, silver, etc)
  • Add the ability to read color from rarity name (common, uncommon, rare, epic)
  • Add the ability to read color from RGB & RGBA

• Initial beam rotation angle now varies randomly between item entities
• Config warns user when invalid items are present

Fixes:

• Apply beam translucency gradient via code rather than via texture, beams should now have a cleaner look
• Beam rotation is now continuous and no longer pauses momentarily
• Beams now won't render if the item entity itself is too far to render
• Beam rarity uses Forge's item rarity system (rather than Minecraft's)
• Beam height is now accounted-for in frustum check
• Minor performance improvements

Misc:

• Minor tweaks to config default values to better reflect the new rendering changes (fullskele)
• Legendary Tooltips compat is rerun if its config changes
• Updated build.gradle