added isApplicable support to representation provider & registry

...odel-props/rcsb/representations/assembly-symmetry-axes.ts

src/mol-repr/representation.ts

src/mol-repr/structure/representation/ball-and-stick.ts

src/mol-repr/structure/representation/carbohydrate.ts

src/mol-repr/structure/representation/cartoon.ts

src/mol-repr/structure/representation/distance-restraint.ts

src/mol-repr/structure/representation/gaussian-surface.ts

src/mol-repr/structure/representation/gaussian-volume.ts

src/mol-repr/structure/representation/molecular-surface.ts

src/mol-repr/structure/representation/point.ts

src/mol-repr/structure/representation/putty.ts

src/mol-repr/structure/representation/spacefill.ts

src/mol-repr/volume/direct-volume.ts

src/mol-repr/volume/isosurface.ts