Gamevar operators

<operator>var <gamevar> <value>
<operator>varvar <gamevar> <value>

Gamevar operators are commands that perform various mathematical operations on gamevars.

For example:

setvar temp 1 assigns a value of 1 to the gamevar temp.

addvar temp 1 adds 1 to temp, causing its value to become 2.

mulvar temp 2 multiplies temp by 2, causing its value to become 4.

Operator	C/C++	Math	Description	Notes
set	=	=	assignment
add	+	+	addition
sub	-	-	subtraction
mul	*	×	multiplication
div	/	÷	division	Ensure that <value> does not equal 0 at any time.
mod	%		modulus, remainder	Ensure that <value> does not equal 0 at any time.
and	&		bitwise AND	The bits in the result are set only if they were set in both of the values being operated on.
or	|		bitwise OR	The bits in the result are set only if they were set in either of the values being operated on.
xor	^		bitwise XOR	The bits in the result are set if only one of the values being operated on has those bits set.

Commands with an additional "var" suffix take gamevars rather than constants or defined labels for their inputs. As an alternate short form, "varvar" can be dropped from these commands; for example ife serves an an alias for ifvarvare.