Sheet updated to rv20220701

Okay, where to begin? You may notice a very heavy restructure of the tilesheet's contents. Had to do it this way to squeeze the new stuff into it without making the file way bigger than it already is.

Some redundant tiles are removed as I now made cliff-framed autotiles for the default floors and extended variety of additional cliff-forms. And don't forget the stairs (also included the ones from the dungeon-set so all are present here).

This now occupies a huge amount of space in the sheet, but there's still some left. Besides all of that, there aren't many new objects in this update. And at last, some cliff-variations from rv20220630 were incorrect.