Fix logging errors and format

[bradbury]

There are some discrepancies with the time data in the game log. There are also some errors in logging including empty data reported. Regarding format, we need to revise to make it easier to parse.

[MichaelMiljanovic]

Logging needs to be modified to better support the following aspects of data collection:

1. Average seconds taken per level (per cohort & per student)
2. Total failures per level (per cohort & per student)
3. % of students who complete a given level
4. % of students who fail a level at least once
5. Mode of gameplay (Non-adaptive, adaptive gameplay, adaptive hints)
6. (Average) Idle time (per cohort & per student)

[MichaelMiljanovic]

Things to log:
competence (per level, vector of values)
cause of failure (obstacle, misuse of bugcatcher) / counting each event
move mode (adaptive (hints/gameplay) /nonadaptive) to higher level
logging levels completed / debug mode setting / picking levels