Sight's Vanilla Expanded

# Changes
- Fried Eggs now have a new texture.
- Added Colored variants for the Caution block.
- Charred Doors and Trapdoors are now craftable.
- Added Iron Gates (experimental).
## Blocks
- Added Colored variants for the Caution block.
  - The old Caution block has been renamed to "Yellow Caution" & has a new texture to reflect the change.
  - They're crafted the same way you'd craft the old Caution block.
- Changed the registry of the old Caution block to 'minecraft:yellow_caution' (from 'minecraft:caution').
  - This means that if you placed Caution blocks before this version, they'll be gone.
### Iron Gates
  - They're kinda unfinished, as they aren't where I want them to be yet, and they have a placeholder texture.
  - Acts like an Iron Door.
## Items
- Changed the texture of the Fried Egg.
  - Looks more appetizing!
## Recipes
- Added a crafting recipe for Charred Doors and Trapdoors.
  - I forgot to do that before. Oops!
  - They are grouped together with regular wooden doors/trapdoors respectively.
- Added a crafting recipe for Iron Gates.
  - Crafted by placing an Iron Door in the crafting grid center and place Iron Bars in the shape of a plus.
## Bug fixes
- Fixed some stairs and slabs still letting light pass through.
  - Now it should be fixed for good.
- Inverted the recipe of the Caution blocks to better reflect the new textures.
- Other small behind-the-scenes fixes.