Allow late editing of capturing groups

[noxone]

When editing capturing groups #109, enable the user to do the following things:

• Allow users to rename capturing groups ✅
• Allow conversion of existing groups to capturing groups (and the other way round)
• Improve capital letters in caption (in general)
• Offer the possibilities for groups (or maybe in general for every part of the regex):
  • optional: ? ✅
  • repeatable *✅, +✅ or {3,5}
  • Lazy/Greedy-Flag ✅
  • flags in general (case-sensitivity, multiline, etc...)
• only allow valid group names (see: https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#groupname) ✅
• properly change groups when editing the input
• Include an optimizer to eliminate unnecessary groups
• Adjust driver.js to new UI