use drawbuffers for picking

CHANGELOG.md

src/mol-canvas3d/passes/pick.ts

src/mol-gl/shader-code.ts

src/mol-gl/shader/chunks/assign-color-varying.glsl.ts

src/mol-gl/shader/chunks/assign-material-color.glsl.ts

src/mol-gl/shader/chunks/color-frag-params.glsl.ts

src/mol-gl/shader/chunks/color-vert-params.glsl.ts

src/mol-gl/shader/cylinders.frag.ts

src/mol-gl/shader/direct-volume.frag.ts

src/mol-gl/shader/image.frag.ts

src/mol-gl/shader/lines.frag.ts

src/mol-gl/shader/mesh.frag.ts

src/mol-gl/shader/points.frag.ts

src/mol-gl/shader/spheres.frag.ts

src/mol-gl/shader/text.frag.ts