Use java.nio to make file executable (#317)

Bump commons-io to version 2.19.0 in core and tests modules

Update README.md

Optimize single-color fill methods (#304)

* Fix and tune JMH benchmark setup

* Upgrade JMH plugin to 0.7.3. Version 0.5.3 is not compatible
with Gradle 8

* Enable GC profiler to track allocation rates in addition to latency

* Add a benchmark for the ImmutableImage.filled method

* Optimize single-color fill methods

Avoid repeated calulations and allocations for the same color for
ImmutableImage.fill, MutableImage.fillInPlace, and AwtImage.isFilled
methods.

Bumped 12monkeys and drewnoakes

Updated to use webp 1.4.0 (#297)

Whitespace build to test secrets

fix withMultiThread (#290)

Added the option to use multithreading when encoding webp (#287)

Co-authored-by: shinyook.lee <shinyook.lee@navercorp.com>

fix color average (#280)