Add support for protocol version 800 (1.21.80)

Introduced support for protocol 800, including biome definitions, camera presets, and player list updates. Upgraded dependencies, adjusted mappings, and enhanced the README to reflect recent changes.

legacyver/v800.go

@@ -0,0 +1,23 @@
+package legacyver
+
+import (
+	_ "embed"
+	"github.com/akmalfairuz/legacy-version/mapping"
+)
+
+const (
+	// ItemVersion800 ...
+	ItemVersion800 = 251
+	// BlockVersion800 ...
+	BlockVersion800 int32 = (1 << 24) | (21 << 16) | (80 << 8)
+)
+
+var (
+	//go:embed data/required_item_list_800.json
+	requiredItemList800 []byte
+	//go:embed data/block_states_800.nbt
+	blockStateData800 []byte
+
+	itemMappingLatest  = mapping.NewItemMapping(requiredItemList800, ItemVersion800)
+	blockMappingLatest = mapping.NewBlockMapping(blockStateData800)
+)