Fixes analytics timers, reorders levels, fixes tall wall prefab.

- Adds WallTall prefab to Wall layer.
- Fixes level 1 map; converted some empty spaces to invisible walls.
- Moves 'Washington' level to second-to-last.
- Displays 'Level 0', aligning level numbers with code.
- Changes timers for analytics; pauses timers on death or level
    load, resumes on first pillar clicked.