wip, geo data from texture, mc normals

src/mol-geo/geometry/isosurface/isosurface.ts

src/mol-gl/compute/histogram-pyramid/reduction.ts

src/mol-gl/compute/marching-cubes/isosurface.ts

src/mol-gl/renderable/isosurface.ts

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

src/mol-gl/shader/chunks/assign-group.glsl

src/mol-gl/shader/chunks/assign-marker-varying.glsl

src/mol-gl/shader/chunks/assign-position.glsl

src/mol-gl/shader/chunks/assign-size.glsl

src/mol-gl/shader/lines.vert

src/mol-gl/shader/marching-cubes/active-voxels.frag

src/mol-gl/shader/marching-cubes/isosurface.frag

src/mol-gl/shader/mesh.vert

src/mol-gl/shader/points.vert

src/mol-gl/shader/spheres.vert

src/mol-gl/shader/text.vert

src/tests/browser/marching-cubes.ts