KEYBOARD_HACK breaks with escaped quotes

[Linus Kardell <linus.kardell@xxxxxxxxx>]

So, zsh has the KEYBOARD_HACK option as an anti-annoyance feature, which 
removes a trailing quote character in case you accidentally hit it along 
with enter. However, this naively looks at whether there is an odd 
number of quotes at the command line, which causes it to invert when you 
have (and odd number of) escaped quotes, removing the trailing quote 
when it shouldn't and vice versa. For example, if you write 
'test'\''test' or 'test'"'"'test'' with this enabled, zsh will 
inapropriately remove the trailing quotes, whereas if you write echo 
'test'\''test'' it will not remove the trailing quote. Instead, zsh 
needs to more smartly check whether the quoting is unbalanced and if 
removing the trailing quote would make it balanced.

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