[ci skip] Remove old todo file

todo.txt

@@ -1,11 +0,0 @@
-Add Timings to LevelTicks and EntityTickList
-Check if PlayerNaturallySpawnedEvent is called correctly
-Improve Server Thread Pool and Thread Priorities: mojang added a max thread count property
-Use Vanilla Minecart Speeds: is this needed?
-0467-Optimize-WorldBorder-collision-checks-and-air check first hunk that has been removed
-
-check ChunkHolder#updateFutures async catcher
-
-
-optimize nearby player lookups - look at patch and updateranges diff in chunkmap (why is it in this patch)
-GENERAL_AREA_MAP_ACCEPTABLE_SEARCH_RANGE_SQUARED is unused?