Allow resizing the canvas + full screen #6
Description
- Make canvas 1280x720 (see if it doesn't collide with sidebar though)
- Make clicking on "fullscreen" button trigger a resize function
- Store the current resolution on the renderer class
- Make the graphics classes work with percentages + change all current pixel values
- Add a resize function (triggered when going to full screen and when leaving) so it changes all x/y values of rendered objects