Add firefly spawn support for Mariposa's redwood forests

2.4.7-1.21.1

Fix effective ambience not playing

Update build.gradle

Update changelog.md

Half firefly spawning density

Reduce rain ripple default density to 1

Fix firefly dynamic lights causing framedrops

Add veil compat to shaders

Reduce glow squid dynamic light brightness in half and double radius

Remove core package

Remove the ambience package and merge with core

Update gradle.properties

Add dynamic lights to allays (respects color if golden allays is enabled) + toggle config option

Add config options for dynalights