New features in CC: Tweaked 1.94.0

* Add getter for window visibility (devomaa)
* Generic peripherals are no longer experimental, and on by default.
* Use term.blit to draw boxes in paintutils (Lemmmy).

And several bug fixes:
* Fix turtles not getting advancements when turtles are on.
* Draw in-hand pocket computers with the correct transparent flags enabled.
* Several bug fixes to SNBT parsing.
* Fix several programs using their original name instead of aliases in usage hints (Lupus590).

Type "help changelog" to see the full version history.
