Time handling, Toggl API

- Cleaner implementation of Toggl API
- Always quantize time (simplify the code)
More accurate time tracking across midnight
Use a simple keyword for starting timers

This makes timer creation more responsive
Add option to quickly stop all running timers
Normalize 'stop_current' action

- Make 'toggl.' a keyword instead of a script filter for speed.
- Make the 'stop_current' current action tell the user which timer was
  stopped.
Maintain active project when continuing

When continuing a task, the project ID will be maintained.
Update help; change reporting command back to #
Update README