FLAG_OR+FLAG_DIFFERENT_VARIABLE Add support for OR in flags and for other variables in same statement

[gtker]

Wrath MovementInfo requires

struct MovementInfo {
    MovementFlags flags;
    ExtraMovementFlags extra_flags;
    u32 timestamp;
    Vector3d position;
    f32 orientation;
    if (flags & ON_TRANSPORT) {
        TransportInfo transport;
        if (extra_flags & INTERPOLATED_MOVEMENT) {
            u32 transport_time;
        }
    }
    if (flags & SWIMMING || flags & FLYING || extra_flags & ALWAYS_ALLOW_PITCHING) {
        f32 pitch1;
	}

Test case is

flag A : u8 {
	ONE = 1;
	TWO = 2;
}
flag B : u8 {
	FOUR = 4;
	EIGHT = 8;
}

struct T {
	A a;
	B b;
	if (a & ONE || a & TWO) {
		u8 one_two;
	}
}

and

struct T {
	A a;
	B b;
	if (a & ONE || a & TWO || b & FOUR) {
		u8 one_two_four;
	}
}

It is unknown exactly what the generated Rust code should look like.

[gtker]

SpellCastFlags also needs this.