2d-graphics

The NumberInput widget should support more common ways of modifying numerical widgets, namely:

• Holding down the mouse button on the arrow to change it multiple times. This should probably work like key repeat, with an initial delay and a constant rate of repetition.
• Clicking and dragging on the clickable region of the widget to change the value. The change should either be proporti

Hey all! I am trying to use the placeimage() function to place an image matrix over a drawing.
But I think the current approach here https://github.com/JuliaGraphics/Luxor.jl/blob/3d6b98348a1b7ba852c801d6ef205773fb6e454c/src/images.jl#L194 might be a little buggy?

The image placement is good as long as it has square dimensions(the image to be placed)
eg: `placeimage(img, centered=true, Poi