Add doc to list breaking changes for the next major release

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+# Minetest Major Breakages List
+
+This document contains a list of breaking changes to be made in the next major version.
+
+* Remove attachment space multiplier (*10)
+* `get_sky()` returns a table (without arg)
+* `game.conf` name/id mess
+* remove `depends.txt` / `description.txt` (would simplify ContentDB and Minetest code a little)