reset option and time split selection

[tekcaa]

I'd love for the Reset button to also reset the active rounds(e.g. 2/4 --> 0/4) or for another total reset button to be added, Also, I think it would be useful to add the option to manually type in the time split because I've found the slider not very comfortable, especially when using a trackpad. Other than that I've found the program to be very useful, you've done such a great job!