• Remove lazy accessors for fields. They are adding extra overhead in terms of memory and they are way too heavy for one threaded environment complex for Android world.
• Remove kotlin stdlib methods in onDraw. They are just adding extra allocations while trying to draw on Android canvas.
• Some code overall clean up.
• Migrate sample to AndroidX.
• Update dependencies for Kotlin and plugins.

• Added ability to stop snowfall without making it disappear.
• Fixed memory leak related to inner HandlerThread.

• Fix support Android 4.3 and below (issue with onVisibilityChanged).

• Changed min API level to 16 (Android 4.1).

• Fixed crash in case if view has initially visibility GONE.

• Snowflakes are reset when visibility changed to GONE.
• Fixed Android Studio Preview rendering issue.

• Draw optimization.

• Support different start position on y-axis for snowflakes (attr snowflakesAlreadyFalling).
• Rename attr snowflakeFadingEnabled to snowflakesFadingEnabled.
• Fixed animation lags.
• Fixed API 15 support.

• Support custom snowflake image (attr snowflakeImage).
• Support custom snowflake angle (attr snowflakeAngleMax).
• Support custom snowflake speed (attrs snowflakeSpeedMin, snowflakeSpeedMax).
• All snowflakes are unique (size, speed, angle, alpha, start position).
• Calculate size by using gaussian ("normally") distribution.

Initial release.