feat(pack): replace FTB Chunks with Open Parties and Claims and Xaero's maps

FTB Chunks is the only mod in the FTB suite that nothing else depends on --
FTB Quests requires FTB Library and FTB Teams only, and ships no claim-chunk
task type -- so it can leave without touching quests. Open Parties and Claims
takes over claims and force-loading, and the Xaero's suite restores the
minimap, world map and waypoints that b0542f9 removed.

The three Xaero's entries are byte-identical to the ones b0542f9 deleted, so
this reverts the map half of that commit rather than integrating anything new.
Xaero's + OPAC is also the pairing both projects document: the world map
displays OPAC claims and lets you claim and forceload from the map screen.

Drops config/ftbchunks-client.snbt and the .packwizignore negation that
shipped it, since the FTB Chunks minimap it enabled no longer exists. Also
keeps authoring/review material and migration scratch out of the pack index.

Server-side follow-up (not shippable, lives in the world save): set
maxPlayerClaimForceloads to 25, point primaryPartySystem at FTB Teams, and
decide claims.forceload.offlineForceload.

mods/xaeros-minimap-world-map-waystones-compatibility-forge.pw.toml

@@ -0,0 +1,13 @@
+name = "Xaero's Minimap & World Map - Waystones Compatibility"
+filename = "xaeros_waystones_compatibility-NeoForge-1.21.1-2.1.0.jar"
+side = "both"
+
+[download]
+url = "https://cdn.modrinth.com/data/7mLhyqIY/versions/k8wIAiWT/xaeros_waystones_compatibility-NeoForge-1.21.1-2.1.0.jar"
+hash-format = "sha512"
+hash = "440da659b1c406ff410841248a28adba60b73f3d91f513ba335b9e5d44b3e48ab63d5ecc86484ff1e3d1a4f7830ad7566fc1efec2a03eba3c958b414b61feea0"
+
+[update]
+[update.modrinth]
+mod-id = "7mLhyqIY"
+version = "k8wIAiWT"