[glsl-in] 2D array support

[fintelia]

This shader:

#version 460 core

shared float h[2][2];

void main() {}

produces this error:

error: Expected Comma or Semicolon, found LeftBracket
  ┌─ shader.comp:3:18
  │
3 │ shared float h[2][2];
  │                  ^