Implement civilization flow mechanics and profiling for resource allocation

- Added `civilization_flow.gd` to manage continuous expected flows and resource allocation within civilizations.
- Introduced `allocate_profiled` and `whole_quotas` functions in `quantity_math.gd` for precise stock allocation based on float shares.
- Enhanced `credit` logic in `object_ledger.gd` to handle production remainders more effectively.
- Updated `append_batch` in `object_batches.gd` to prevent batch creation for invalid IDs.
- Introduced `ratio_approx` function in `exact.gd` for better handling of float profiles.
- Added a benchmark script `benchmark_civilization_flows.gd` to evaluate the performance of civilization flow mechanics.
- Refactored various functions to improve clarity and efficiency in handling resource flows and allocations.

tests/test_module_lifecycle.gd

@@ -17,7 +17,7 @@ func run() -> void:
     var World = load("res://world/owniverse/owniverse.gd")
     var first = World.new()
     var second = World.new()
-    var names: Array = ["batches", "ledger", "production", "automatic", "stellar", "life", "environment", "evolution"]
+    var names: Array = ["batches", "ledger", "production", "automatic", "stellar", "life", "environment", "evolution", "civilization_flow"]
     var references: Array = []
     for name in names:
         check(E.ne(first.get(name), second.get(name)), E.add("World has its own ", name))