Improve the plaquette creation UI

[rryoung98]

The creating a plaquette functionality at the moment involves dragging the closest plaquette up down left and right.

However, this functionality creates a buggy experience where plaquettes will pop up when the (deltaX-initialposition) is large enough and the mouse was recently clicked but not pressed down.

We want to remove to improve this by perhaps using arrow keys or another method that is more definite.