mapsyncer-paper 0.2.0: Paper 26.3

Build against the 26.3 dev bundle (26.3.build.151-beta; no stable build
exists yet).

26.3 rewrote the block palette in region files: a default-state block is a
bare string, any other state is {id, properties}, and a list mixing both
wraps the strings as {"": name}. The parser cast every entry to a
compound with Name/Properties, so every chunk saved by 26.3 threw
ClassCastException and the whole region failed to render. Both formats are
read now (a region holds a mix until every chunk is re-saved), and a chunk
that fails to parse is skipped instead of aborting the region.

NOTICE.md

@@ -28,6 +28,11 @@ diffs stay readable:
 - `mca/ChunkDataParser.java` — heightmap bit width uses vanilla's
   `ceillog2(height + 1)` (upstream under-counts by one for 256-high
   dimensions); accepted chunk statuses include `initialize_light`.
+- `mca/ChunkSectionParser.java` — reads the 26.3 block palette format (bare
+  string entries, `{id, properties}`, `{"": name}`) alongside the old
+  `{Name, Properties}` one. Same approach as upstream PR #26.
+- `mca/convert/io/McaRegionLoader.java` — a chunk that fails to parse is
+  skipped instead of aborting the region.
 - `XaeroWriter.java` — moved from `com.mapsyncer.server` to `com.mapsyncer`.
 - `render/BlockPropertyResolver.java`, `render/PlaceholderBlockGetter.java` —
   package moved; the cache-size constant is inlined.