fix(npm): clean script was missing folders

1. No longer uses lerna and instead specifies glob patterns
2. Expands the deletion of generated Typescript code to all
packages where it's present not just the api-client package.
3. Deletes the two files that were meant to be deleted to
begin with, but since the clean script was not fully working
they were actually left undeleted until now.

Fixes #469

Signed-off-by: Peter Somogyvari <peter.somogyvari@accenture.com>

package.json

@@ -8,7 +8,7 @@
     "start:api-server": "node ./packages/cactus-cmd-api-server/dist/lib/main/typescript/cmd/cactus-api.js --config-file=.config.json",
     "start:cockpit": "lerna run --scope '*/cactus-cockpit' --stream serve:proxy",
     "start:example-supply-chain": "node ./examples/supply-chain-app/node_modules/.bin/cactus-example-supply-chain-backend",
-    "clean": "lerna exec --stream --ignore '*/*cockpit' -- del-cli dist/** && del-cli packages/cactus-api-client/src/main/typescript/generated/openapi/typescript-axios/*",
+    "clean": "del-cli \"./packages/cactus-*/{dist,.nyc_output,src/main/typescript/generated/openapi/typescript-axios/*}\"",
     "lint": "lerna exec --stream --ignore '*/*cockpit' -- cross-env DEBUG= tslint --project tsconfig.json",
     "tsc": "lerna run tsc",
     "build": "npm-run-all build:dev build:prod",