Adding Text Tool for Canvas

I've added a simple tool that will allow you to add text to the canvas. It's basic right now, but can be expanded in the future with the ability to change font size for example. You click on the button to select the text tool, you are then prompted for the text you wish to enter and then you can place and drag the text. Works great on mobile as well.

I've added simple icon for the text button in the toolbar, but this should probably replaced with something that doesn't require a license to include. For now, I've included a copy of the license as well in the images folder which can be removed if you have a better icon.