Try/catch and error throw/catch

[cgcardona]

We're working on a debugger and meep integration but it could also potentially be nice to have a try/catch block and the ability to throw/catch errors w/ custom error messages.

[rkalis]

Script itself doesn't support the "catching" of errors or throwing of custom errors, so this is something that would likely be implemented within some sort of debugger environment / libauth evaluation, which have their own issues, so I'm closing this issue.