Graph GLSL functions.glsl: Complete overload vec2 and vec3 variants; Fix 'and'/'or' semantic (swapped); Add EPSILON in clip_coord(..) and add is_inside(..) function

Complete overload vec2 and vec3 variants

Fix 'and'/'or' semantic (swapped)
- 'and' uses multiplication, i.e. all arguments must be > 0 (ideally 1)
- 'or' uses addition, i.e. only one arguments must be > 0 (ideally 1)
- both uses clamp [0..1]

Add EPSILON in clip_coord(..)
- Only 'coord > high+EPSILON' is outside

Add is_inside(..) function
- Similar to clip_coord(..) but returns float 0 or 1
  instead of selecting color.

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