4.0.0

• feat: make pm2 fully standalone with node embedded
• feat: startup, npm, node system adaptation for standalone installs
• feat: system information worker - retrieve:
  - network I/O + latency
  - disk I/O + space
  - cpu usage + temperature
  - memory usage
  - intelligent display of information (e.g. display disks > 80% cpu usage)
• feat: listing of docker container on host machine with independent pm2 list
• feat: upgrade of Chokidar to 3.x - Massive CPU & RAM consumption improvements for watch feature
• r&d: manage container like pm2 processes
• feat: intelligent display of high loaded processes in an independent pm2 list
• feat: #4224 --ignore-watch now accepts globs (@vaskevich)
• feat: pm2 save --force allow to force save of empty process list
• fix: pm2 monit dashboard without leaks
• fix: pm2 register fixed
• refactor/fix: pm2 listing systems refactoring
• chore: remove old legacy code for < 8 Node.js versions
• chore: make the repo lighter
• chore: better display when pm2-runtime is linked to on-premise
• chore: pm2 CLI refactoring #4391