Signed-off-by: Craig Robbins <kde.psych@gmail.com>

This reverts commit dcce6e97.

Boats mod improve y motion. Smaller collision box. Reverse turn with negative velocity only. Smooth turning. Enable underwater higher acceleration

It's now in game_api.txt

Mirror the setup of a door placed next to any door, not just next to
a door of the same type.  This is particularly useful where there are
multiple door types that have the same appearance, but one wants the
doors of a pair to have different behaviour in some other respect.

When a trapdoor is mounted upside down, to make its top surface flush
with the floor above when closed, it is necessary to have some way to
climb through the trapdoor node when it's open.  Making it climbable
like a ladder satisfies this need.  It is somewhat realistic, as a real
trapdoor can have a ladder segment mounted on one face.  When the trapdoor
is mounted in its default orientation, making the bottom surface flush
with the ceiling below when closed, the climbability when open is not
strictly necessary, but is still a convenience.

The message to "hold shift" makes an unwarranted assumption about the
user's keybindings.  Messages from the server should refer to a key's
game function, rather than its extragame identity.