Different Double Slabs

This release is tested with all versions 1.10 and up!*†

*Versions 1.10.0-1.20.0 have a warning claiming incompatibility. Just ignore it.

†The resource pack won't automatically have support for any new slabs added after 26.4, so message me on Discord reminding me to add them! (@owehttamy)

Changes:

• Added support for 26.3
  • Concrete slabs

Have a wonderful day, folks. :)