introducing srcdoc polyfill for edge

wrapping in test buttons

refuse unit nav if not presentationComplete but time  over

start-code prompt
restore last testlet time only if hot
wrap navbuttons only

enter startlockbuttondialog
logging off
pagenavi off
naviarrows off

Loading booklet progress bar

bugfixes

start working on timer

lock booklets by testee
disable buttons if booklet locked
Beendet message

srcdoc-polyfill removed

unit type -> player

restorepoint save+load
booklet state save+load
booklet log
unit log