Add stop for scripts

Must
- when run, script returns unique id or time/date for stopping
- Run button to become Stop when running

Should
- allow script with same ids to run
- allow same script to run multiple times
- Show log
  - may be total log which would also show 'process id'
- stop script if connection dropped
  - ?refreshed?

Taskbar enhanced / or hub

- to show currently running scripts
