Symbolstore: Make collect_symbols.py read the msi file to ensure proper file-name mapping

- The files in the msi file can have their name changed (e.g. dashes become underscores).
  This means that not all files got properly replaced (e.g. mumble-g15-helper.exe).
  Now using msilib to read the filename mappings from the msi database to ensure
  correct mapping.
- Added glob filename handling. Always select first matching.