Improve node/npm build stability

For all supported CMS versions that use node:

• 7.9.x
• 10.1.x
• 10.2.x

to the following modules:

• Hippo Theme
• Channelmanager/frontend,
• Channelmanager/angularjsapi ,
• Targeting/frontend
• Essentials

we should add:

• Peer dependencies to package.json
• A .npmrc with engine-strict so npm install will fail if a dependency specifies it does not work on the current node engine
• A npm shrinkwrap json to lock dependency tree
• Add npm rebuild command to the maven build in the pom.xml

Jenkins builds should:

• Use the latest Stable node version that we require
• Throw away node_modules folder after upgrading to a new node version