Adds a timer for NES speedruns where the goal is to complete 100 lines. Future additions may include the ability to choose between several categories, as well as a “qualifying” mode for NES Tetris tournaments. Some technical notes:

• The timer assumes a 60fps console, when in actuality most NES’s run at ~60.098fps. This is not really a massive issue because it takes over 10 minutes for the error to exceed a second, but the correct time can be found by multiplying the raw time by 60/60.098.
• Pausing is disabled.
• Until the run’s completion, the displayed time is actually a frame longer than the actual elapsed time. For some reason the timer stops incrementing the frame before 100 lines is visibly reached, so this discrepancy is compensated for here.

• Database match: Tetris (USA)
• Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
• File SHA-1: 77747840541BFC62A28A5957692A98C550BD6B2B
• File CRC32: 6D72C53A
• ROM SHA-1: FD9079CB5E8479EB06D93C2AE5175BFCE871746A
• ROM CRC32: 1394F57E