Add directory listing and selections to home screen
Speedup boot time by removing Serial waits, also start bootup sequence as soon as button is held for required duration, do not wait for it to be released
Periodically (every 10 pages), trigger a full refresh to update the eink
Fixes crash where screens could exit mid-eink update which would cause a lot of issues
Fixed a memory leak with Epub objects getting orphaned, opening and closing epubs in succession should no longer crash the app
