Wire, Link.Socket, Link.Local and Sound moved to cauldron_2d_net as
Cauldron2D.Net.*; the view takes the same links under their new names.
Cauldron2D.Wx.View.pointer/2 and the :pointer option: whether the pointer aims.
Cauldron2D.Wx.View :on_stats, :show_stats and show_stats/2: the frames received
and the draws made each second, told to the game or drawn in the canvas corner.
Cauldron2D.Wx.Link.Socket delivers the server's "audio" format and takes an
:audio option to ask for one; Sound.format/3 reopens the speaker at it, and the
view does so on its own.
Cauldron2D.Wx.View zoom: true and zoom/2: +/-/0 and the wheel change the
tile size from 2 pixels (or the whole map in view) to 64; a map that fits in 4096
pixels a side is drawn from one bitmap of it (Painter.layer_blits/2,
layer_offsets/4, mover_blits/4). Sheet.load/3 takes a fractional scale;
Sheet.unload/1.