v0.2.0

Structural Changes

• Separated functions in previous core module into separate modules
• Added multithreading support for some functions (indicated by the _par suffix in the function name) via
  rayon

Modifications

• image::Image::new() renamed to image::Image::from_slice()
• filter::median_filter() and filter::alpha_trimmed_mean_filter() re-implemented using a faster algorithm based on
  Ben Weiss' fast median filtering algorithm

New Stuff

• image::Image::from_vec()
• image::Image::from_vec_of_vec()
• image::Image::from_vec_of_slice()
• image::Image::get_pixel_unchecked()
• image::Image::get_pixel_mut_unchecked()
• util::get_2d_coords()
• util::math::cubic_weighting_fn()
• util::math::clamp_zero()
• util::math::sinc_norm()
• util::math::lanczos_kernel()
• util::math::separate_kernel()
• convert::scale_channels()
• enums::Scale::{Bicubic, Lanczos}
• From trait implementations between common Image<T> types
• transform::scale() now supports bicubic interpolation and Lanczos resampling methods for image scaling

Bug Fixes

• Fixed bug in filter::derivative_mask()