fix: shader error occurs under certain conditions

fix: Shader error occurs under certain conditions lilxyzw#308

fix: avoid error in old gpu lilxyzw#306

chore: 2.1.1

chore: 2.1.0

BREAKING CHANGE: remove obsolates and many legacy features

Merge pull request lilxyzw#277 from lilxyzw/dev-1.7.x

Dev 1.7.x

Merge pull request lilxyzw#275 from lilxyzw/dev-1.7.x

Dev 1.7.x

Merge pull request lilxyzw#273 from lilxyzw/dev-1.7.x

chore: VRC Light Volumes without package lilxyzw#272

Merge pull request lilxyzw#271 from lilxyzw/dev-1.7.x

Dev 1.7.x