[Geometry/XY] Added XY.is_zero(threshold:Real64) and Real64.lerp(XY,XY|Line)->XY
[Geometry/XY] Added XY.is_zero(threshold:Real64) and Real64.lerp(XY,XY|Line)->XY

- XY.is_zero(threshold:Real64) returns true if absolute values of x and y are at or below a given threshold.

- Real64.lerp(a:XY,b:XY)->XY is equivalent to Math.lerp(a:XY,b:XY,progress:Real64)->XY
- Real64.lerp(Line)->XY is equivalent to Math.lerp(Line,progress:Real64)->XY

Plasmaworks/Rogue,Plasmaworks/Rogue,AbePralle/Rogue,Plasmaworks/Rogue,Plasmaworks/Rogue,AbePralle/Rogue