Add support for PrimitiveType::Points

[rlofc]

This will allow using PrimitiveType::Points when creating a new Material in macroquad, like so:

let material = load_material(
    ShaderSource::Glsl {
        vertex: VERTEX_SHADER,
        fragment: FRAGMENT_SHADER,
    },
    MaterialParams {
        pipeline_params: PipelineParams {
            // Added PrimitiveType::Points can be used in PipelineParams to render points rather than
            // lines or triangles.
            primitive_type: miniquad::PrimitiveType::Points,
            color_blend: Some(blend_mode),
            alpha_blend: Some(BlendState::new(
                miniquad::Equation::Add,
                miniquad::BlendFactor::Zero,
                miniquad::BlendFactor::One,
            )),
            ..Default::default()
        },
        ..Default::default()
    },
)

and is useful for various particle effects.

[not-fl3]

Thanks for PR!