Toolbar

[sunjay]

A toolbar with options for pausing, restarting (maybe), clearing the image, saving the current image, recording a gif/animated svg, etc. The look of the toolbar should be similar to how Peek incorporates everything into the top bar of the window. The toolbar can also have controls for things like full screen, zoom, recenter, etc.

It should be possible to disable/hide the toolbar.

In the future, we may want to support a more configurable toolbar that can even be replaced by the user.