Improve the code and add vertical movestones

It wasn't necessary, actually.

Fixes a part of #290.

Cyan, magenta, orange, pink, violet and white.

See #337 for details.

New overheating system that doesn’t use the meta.

* Support detection of multiple players in object detector
* Add distance parameter to node detector
* Fix area protection

* Fix inconsistent insulated mesecon names
* Clarify lightstone names
* Rename meselamp to "Mesecon Lamp"
* Use capitalization "Luacontroller" consistently
* Cleanup / improvements for logic gate naming

It used to be so that you could gain two sticky movestones out of one normal one,
this didn't make much sense.

Fixes #289

Make "on" water turbine animated!

This uses a fairly simple trick: the textures are animated, while the
model is static and has a number of rotated copies of the parts that are
seen to move (four copies of the blades, eight copies of the top/bottom
and their edges).  The opaque parts of the textures then decide which of
those faces' copies are visible in each frame.

This allows finding all of them by searching
"insulated" in the creative menu.

caused by an oversight in ececf525