Variable by reference throws NoArgumentType error.

[stian-overasen]

For functions that accepts passing variables by reference Neutron will throw NoArgumentType error.

Simple example:

/**
 * Undocumented function
 *
 * @param int $foo Foo.
 * @return integer
 */
function any_function( int &$foo ) : int {
    return 1;
}

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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
---------------------------------------------------------------------------------------------
 21 | WARNING | Argument type is missing
    |         | (NeutronStandard.Functions.TypeHint.NoArgumentType)
---------------------------------------------------------------------------------------------