DRAKHYSYS ALL EDITORS V4.8.8.58 - CAMPAIGN EDITOR

Added a CAMPAIGN EDITOR tab and standalone START_CAMPAIGN_EDITOR.bat.

Features:
- Open and save CAMPAIGN.2DA with automatic .bak backup.
- Preserve all existing campaign rows by default.
- Create blank campaign rows.
- Duplicate an existing campaign as a template.
- Edit every CAMPAIGN.2DA field without hardcoding only one game campaign.
- Delete only the explicitly selected row.
- Merge another CAMPAIGN.2DA into the working table.
- Merge is safe by default: same-named existing rows are preserved unless the user enables replacement.
- Missing imported columns are added rather than discarded.
- Duplicate column names such as WORLDSCRIPT are preserved by occurrence and displayed as [1], [2].
- STARTARE helper and a DR0001 convenience button for the selected custom campaign.
- The current DRAKHYSYS-only CAMPAIGN.2DA is supported, and a clean stock CAMPAIGN.2DA can later be merged into it to restore original campaigns alongside DRAKHYSYS.

No original stock campaign rows were invented in this package because the supplied CAMPAIGN.2DA contains only DRAKHYSYS.
