Merge branch 'trunk' into 1.17

# Conflicts:
#	gradle.properties

Iris 1.1.0

Remove internal shaders because they are too broken

Iris 0.4.0

Iris 0.3.0

refactor: Move pipeline management to a separate class, allow disabli…

…ng shader-based rendering entirely

Basic implementation of disabling "Old Lighting" for Sildur's

Does not affect the internal shaderpack