show-tileset-diffs.pl - Now only prints to stderr safe changes to apply.

'Safe' changes are those which do not contain any changes to any of
the display code. At the time of writing, about 30% of changes are
safe to apply automatically.

Unsafe changes are emitted to stderr.
Automatic harmonization of graphics raws with master files.

Modified all tilesets to match the maste files where diferences were
detected in *non-display* elements.

This is an automatic harmonization on changes which were detected
to be safe, and constitutes approximately 30% of the detected
significant, non-display differences between tilesets and the master
files.

The remaining ~70% of mismatches require either human intervention,
or (more likely) smarter code to harmonize them.
Merge branch 'harmonize_raws' into unified