Added
* Added a "reset" button in the topright corner to reset the state and clear out the old history
* Can now have Pillow images in State
* Proper file handling support; this changes buttons to now POST requests instead
* Added `Row` component, `Pre`/`PreformattedText` components
Fixed
* When outputing the current state, properly escape angle brackets
* You can now add styles and attributes to `Div` and `Span` components