shaves ~1kb off JSON

[skwerlman]

to do this I:

• removed some unnecessary locals
• renamed all the local functions (they could be shorter, though)
• renamed most variables
• proxied the string and table APIs
• proxied a number of common functions
• stored common strings in vars

In addition, I:

• separated the functions to their own lines (at no cost!)
• did this by hand, because I forgot about squishy, and also b/c it can't do the string thing
• renamed function references in strings so errors would still make sense

~~I could probably make this smaller, but I want to get to bed soon~~ I think it's close enough to its minimum size for now

[oeed]

Thanks! This looks really useful, I'll look in to merging this afternoon.