Allow declaring multiple members in one expression in shader structs

[Chaosus]

Makes shader allowing such expressions:

struct Test {
	float a, b, c[2]; 
};

This has been fully supported by GLSL.

[akien-mga]

Did you test this syntax too? Not sure if we want to support it but just to make sure it doesn't error/crash:

struct Test {
	float[2] a, b, c; 
};

And will it properly report a syntax error with:

struct Test {
	float[2] a, b, c[4]; 
};

[Chaosus]

@akien-mga Yeah, thanks for this notice - fixed it.
All following members would be arrays with the size defined in the first member.

[Chaosus]

That's, interesting (I didn't know about it before):

so float a[2], b, c; is different from float[2] a, b, c;
The second prevents the changing array size for the following members (and makes them arrays automatically) but the first allows it.

I should check the other places where it may happen and fix it if needed.

[akien-mga]

Thanks!