game over & paused modals offset the game formatting

[Broderick-Westrope]

As shown in the above image, the game over modal/popup badly interacts with the background content. This is likely due to bugs in my overlay util. I'd like to fix it as part of Tetrigo though as it is a good example.

Image annotations:

• 1-2) The content is in bold since the "Game Over" text behind was in bold. The same is true for the underline. Both of these are likely to do with overlaying text during the middle of an escape sequence. Ideally the overlay function would check the portion of each line it is overlaying for escape sequences and close them early. That is, for the Game Over bold and underline the escape sequences should be ended after the "G" that is visible.
• 3-5) These horizontal misalignments are likely all due to the same cause. I am unsure what the cause is, but my first hunch is that fixing the previous point (escape sequence handling) may remove this issue. If not, it will require further investigation.

Sequin is a tool that was recently release that allows viewing/debugging ANSI escape sequences. It will prove useful for this task.