add recolor-on-place helper

if you add `after_place_node = unifieddyes.recolor_on_place,`
to your node def, UD will automatically colorize the node when
placed, using the last dye you colored that kind of node with.

If you switch to some other colorable node, or you run out of whatever
color dye you were using at the time, a warning message will be printed
and the autocolor will be reset back to neutral.

If a player signs off, autocolor for him/her is reset to neutral
(this also helps prevent a minor memory leak)

also get rid of one or two debug prints.

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