fix: improvements relating to Galacticraft accessories

[Roelymole]

• Implemented an item tag solution for specifying which items can be placed in each accessory slot in the Galacticraft inventory in a data-driven way. This should make it easier to allow items from addons/other mods to be placed in the accessory slots.
• Also fixed issues with quickly equipping accessories (both shift clicking in the Galacticraft inventory and 'using' the items).
• The tentative tags are as follows:
  • #galacticraft:thermal/head
  • #galacticraft:thermal/chest
  • #galacticraft:thermal/pants
  • #galacticraft:thermal/boots
  • #galacticraft:accessories/oxygen_mask
  • #galacticraft:accessories/oxygen_gear
  • #galacticraft:accessories/oxygen_tank
  • #galacticraft:accessories/oxygen_tank
  • #galacticraft:accessories/frequency_module
  • #galacticraft:accessories/parachute
  • #galacticraft:accessories/shield_controller
  • #galacticraft:accessories/misc
• Prevented players from freezing in powder snow if wearing a piece of thermal armor (should this require a full set?)
• Added/modified accessory slot sprites:
  • Created a parachute slot sprite.
  • Changed the oxygen tank slot sprite to the letters O₂ as the old sprite looks like a battery and doesn't match the new oxygen tank textures. I tried using the outline of the new oxygen tank textures as the slot sprite, however it went right into the corners which didn't look right.
  • Created a shield controller slot sprite using the vanilla shield slot sprite with a C in the middle (at least until the shield controller gets a new texture).

• Translated and scaled space gear for Evolved Baby Zombies (or Baby Evolved Zombies...?)

[DMgaming100]

all slot textures should be in gui\slot\

[Roelymole]

all slot textures should be in gui\slot\

I have been having unexpected difficulties getting this to work. I will keep trying though.