Merge #72, #59, #45

[pudy248]

• Merged #45. Made some alterations to to fix bugs, including making it work with zoom, making it work with small .bin files, and changing the IO to busses for ease of use.
• Merged #59.
• Merged #72. Fixed 2 minor bugs. Also changed the High-Z value from -1 (no longer usable due to uints) to a random number that hopefully won't be encountered in normal use. This could cause exceedingly difficult-to-trace bugs in people's circuits, but there's not really a different way to do it.
• Increased zoom sensitivity since it was an issue with some users.

Credits haven't been updated so you may want to do that before merging.

[GideonBear]

FYI, #72 is broken:

Loading save files is corrupt; pin names seem to get an incrementing number added to the end of them, and logic is broken in big circuits.