Merge branch 'master' into ply-test

# Conflicts:
#	package-lock.json
#	src/mol-plugin/index.ts
#	src/mol-plugin/state/actions/basic.ts
#	src/mol-plugin/state/objects.ts
#	src/mol-plugin/state/transforms/data.ts
#	src/mol-plugin/state/transforms/model.ts
#	src/mol-plugin/state/transforms/representation.ts