Ability to zoom in and out

[romondi]

No functionality to zoom in and zoom out on browser. (ctrl-) or (ctrl+) on other browsers

[taoteh1221]

Agree zoom really would come in handy in any future builds (as well as saving the window size on exit)...other than that, my app UX ( https://github.com/taoteh1221/Open_Crypto_Tracker ) is great in this container.

Even adding a CSS-based zoom feature into my app causes issues with the detected cursor position by chromium embedded. Chart crosshair hovering and tooltip popin windows are way off in relation to the cursor position, if one zooms in or out too much.