Rotation of Deltas and math

[bc0n]

There needs to be a way to do this, and it should be obvious.

center = Point(0u"m", 0u"m")
an = 1u"rad"
topLeft = Point(-1u"m", 0.1u"m")
tlr = Rz(topLeft, an) + center

I've disallowed Point+Point for conceptual integrity, but this leads to rough edges. And at least right now Rz only operates on Points, not on Deltas, while Delta+Point is the only addition allowed.

[bc0n]

Workaround is to define as needed

  Base.:+(a::Geometry2D.Point, b::Geometry2D.Point) = Point(a.x + b.x, a.y+b.y)