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Implement Basic Arithmetic for Let/Export

Michael Aaron Murphy requested to merge mmstick:let_arithmetic into master

WIth this change, it is possible to take variables which contain numbers, and apply basic arithmetic to them using the let command, without the need for an external application. It performs 32-bit floating point math, so irrational numbers are supported.

let a = 1
echo $a
let a += 4
echo $a
let a *= 10
echo $a
let a /= 2
echo $a
let a -= 5
echo $a
let a = 1;
while test $a -lt 100
    echo $a
    let a += 1
end

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