On a high!

 Very quick update as it's late... implementing the script processing and now it clears the rectangles and prints "HIGH SCORE" in attract mode.

There's a bit of jumping around in the code, but on closer inspection it can be unravelled into a single function... at least that's how it appears so far. So again, as yet, no gymnastics.

In the early stages of implementation - especially with script-driven logic - there's a lot of time spent setting up variables, creating tables and adding stub functions and their prototypes, so progress is slow.