Rich: store unique pixel address to RichPoints (remove z-shift) & cleanup/modernize

related to redmine issue #2898 and #1397 (z-shift)

• Storing pixel address into RichPoints
  - deriving pixel addresses by a scheme based on the pixel geometry path -> Will be added in a separate MR
• fixed memory leak in RichDigitizer in case fCreateMatches is false.
• overall cleanup (removing unused headers, ...) and modernizing range based loops, c-style casts ...

Merge after !1272 (merged), this MR will probably have conflicts.