John Beard e016dc52fd Pcbnew: Add concept of a 'point'
This is a zero-dimensional object that can be used for snapping
and documentation of useful, but non-physical features on a
board or footprint. They do not correspond to any physical
output in exports or plots.

Points do have a "size", but this is a graphical property only
and determines how large they are drawn on the board.

They also have a layer, which allows them to be selected and
made visible according to layer filters.

Fixes: https://gitlab.com/kicad/code/kicad/-/issues/4691
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