Placement does not respect grid

[Jetsama]

When placing DUT, terminals, and wires, morpheus does not place on the grid causing strange offsets and non-snapping wires.
This is a problem if edits are required as connections become confusing.

[Jetsama]

Added "gridSize" to schematic class using the, "self.ws.sch.GetEnv("schSnapSpacing")" command.
This is done in planning rather than in placement, meaning space is allocated correctly by ceiling the x,y values to grid.

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