Add `light` type

[jbunke]

Add a single light type to the scripting API that can be used to define light objects to be passed as arguments to $Graphics functions.

Tasks

• Implementation
  • Type node class
  • Internal representation class
  • Constructor nodes
    • $Graphics.dir_light(float luminosity, color light_color, float[] direction) -> light
    • $Graphics.point_light(float luminosity, color light_color, float radius, int x, int y, float z) -> light
  • Accessor expression nodes
    • L.is_point() -> bool
    • L.get_luminosity() -> float
    • L.get_color() -> color
    • L.get_direction() -> float[]
    • L.get_position() -> int[]
    • L.get_radius() -> float
    • L.get_z() -> float
  • Mutator statement nodes
    • L.set_luminosity(float);
    • L.set_color(color);
    • L.set_direction(float[]);
    • L.set_position(int[]);
    • L.set_radius(float);
    • L.set_z(float);
• Update API
  • light type page
  • Updated function signatures in $Graphics