Small update to the FNaF Timer

- Implemented the Playtime feature, you can use it to keep track of how long modes take you, it's tied to interval files so make sure to have one for each mode you're tracking. You can also change it manually if you want to transition from livesplit, as well as hide it if you don't care about it or change it's color.

- When adding Custom Intervals they now automatically place themselves in the appropriate time, also removed the insert button as it's no longer needed with this feature.

- The timer a bit wider to support longer intervals and labels.

Any suggestions to what could be implemented in a future update would be appreciated.