Lit, Hangable Lanterns

[falkreon]

Makes a number of changes to post lanterns:

• Fixes their luminosity at 15 regardless of what the frame material is
• Adds the 'hanging' property which locates the lantern at the top of the cube it's in
• Updates the blockstate template and models to accommodate the new property
• Updates the post lantern BlockType so it generates the new hanging models
• Removes eight hidden faces from the models
• Changes the voxelshape to fit the model exactly
• New utility class that can ask a VoxelShape if it has a particular 1/16th voxel set

Any lanterns saved in a map prior to this update will unfortunately default to "hanging=true". QSL's datafixers are offline at the moment so I can't make an auto-fix. Any existing lanterns can be fixed by causing a block update, such as placing and breaking a torch next to it.

[woodiertexas]

Looks good to me aside from a few nitpicky things.