Support for cast assignment operator =#

[x87]

https://gtamods.com/wiki/SCM_language#Compound_assignment

=#	Cast assignment	expr0 =# expr1	Cast expr1 to any other type and store the result to expr0

VARIABLES ON BOTH SIDES SHOULD BE DECLARED WITH A TYPE (INT OR FLOAT)

Operation	Opcode	Expression
CSET_VAR_INT_TO_VAR_FLOAT	008C	$i =# $f
CSET_VAR_FLOAT_TO_VAR_INT	008D	$f =# $i
CSET_LVAR_INT_TO_VAR_FLOAT	008E	0@ =# $f
CSET_LVAR_FLOAT_TO_VAR_INT	008F	1@ =# $i
CSET_VAR_INT_TO_LVAR_FLOAT	0090	$i =# 1@
CSET_VAR_FLOAT_TO_LVAR_INT	0091	$f =# 0@
CSET_LVAR_INT_TO_LVAR_FLOAT	0092	0@ =# 1@
CSET_LVAR_FLOAT_TO_LVAR_INT	0093	1@ =# 0@

[x87]

Could be done with the new binary parser #97

[x87]

Also need typing info to resolve correct opcode