add grid for memory visualizers and better gui interface

[mateoconlechuga]

11:49 <•jacobly> MateoC, why does right click memory visualizer use the next pixel if you are one pixel past the start of the pixel :P
11:50 <•MateoC> um
11:50 <•MateoC> probably off by one :P
11:50 <•jacobly> or maybe 1/4 of a pixel
11:50 <•MateoC> It might just be Qt :P
11:50 — •MateoC blames Qt
11:52 <•jacobly> it would also be nice to have an option to add a grid
11:53 <•MateoC> Okay
11:54 <•jacobly> also if only the window got smaller when the scale got smaller :P