Rename SpeechOrPrepManager to MainTimerManager
Add prep time to the "more info" dialog
Add prep timer preferences
Remove pointless descriptions, add Canadian split opp styles, remove
redundant sound attribute from debate format XML files
Change secsToText
Implement prep timer preference for count direction and keep screen on
Obsolete speech format count directions, this closes #18
Take preference out of sub-screens so there is just one preferences list
Move built-in formats to assets/formats (were in assets)
Format bug fixes