Replace import tab with inactive students tab [1/1]

[Problem]
1) The inactive students region provided much more information than what the import tab provided.
2) The UI to set the reset time needed improvement

[Solution]
1) Replace the import tab with the inactive students region
2) Replace the TextView and Inc/Dec buttons with two NumberPicker's
Tap the time left to reset time [1/1]

[Problem]
The UI is cluttered.

[Solution]
Remove the reset time button and instead the user taps the time left TextView to reset the time.