Click event on start button will start stopwatch from the current time.
Start button will be transformed to pause button.
It will enable the split button and disable reset button.
Click event on pause button will pause the stopwatch.
Pause button will be transformed back to start button.
It will enable the reset button and disable split button.
This event add an entery in the log table with pause event and with the time of event triggred.
User click on split button to split the event at that time.
This event add an entery in the log table with split event and with the time of event triggred.
User click on reset button to bring stopwatch to initial state.
