[ENHANCEMENT] Improve analyzing and make it possible to run with cli tools

[d-biehl]

• [ ] collect local variables when analyzing
• [ ] collect more references when analyzing
  • [ ] for testcases
  • [ ] for named arguments
    • [x] for robot keywords
    • [ ] for library keywords
  • [ ] for tags
• [ ] rework rename to use references only
• [ ] rename for tags
• [ ] highlight for tags
• [ ] complete user tags
• [ ] make it possible to run on command line
• [ ] analyse keyword arguments for correct values if type hints are given