Side of trapdoor is rotated between open and closed

The bug

Sides and bottom of trapdoors rotate illogically when opened and closed.

Possible fixes

The sides of trapdoors could be fixed in two ways:

• One is to make them work like doors, with three sides that follow the movement of the trapdoor and one "hinged" side that will stay in place. This option works well on orientable trapdoors, but wouldn't work properly on non-orientable trapdoors, such as oak and iron.

MC-138280 - Hinges.zip

• The other option is to have all four sides to follow the movement of the trapdoor, but without a hinged side. This would work for both orientable and non-orientable trapdoors.

MC-138280 - Sides.zip

What files were changed:

mainly, the "...trapdoor_open" models were split into "...trapdoor_bottom_open" and "...trapdoor_top_open", something similar to how it is done in doors.