Interactive image zooming and intensity profile plotting

[nghia-vo]

I've just added new features to broh5 software that allow users to display a zoomed area or the intensity profile of an image by clicking with the mouse. There're tips that can be useful:

• How to get the correct coordinates of a mouse-clicked location when users click on an image displayed by ui.matplotlib
• How to draw a line or box around the mouse-clicked location using ui.matplotlib.