Make lexer recognize notes separator ???.
Make parser handle notes after notes separator ???.
Refactor Slide constructor to take in single parser slide object instead of source and properties.
Create notes mode.
Add cloning of slideshow.
Add notes shortcut to help screen.
Make notes area unscaled, always on the right-hand side.
Add preview mode.
Use p rather than n to toggle presenter mode.
Tweak spacing in presenter mode.
Correct presenter mode shortcut on help screen.
Refactor overlay into help mode.
Create backdrop element used in help mode.
Load container DOM from HTML and map elements rather than dynamically creating elements.
Add buttons for increasing/decreasing font size in presenter mode.
Update HISTORY.
Update to version 0.5.2.
Fix preview slide display style.