Misc updates and clean up

- WipeTower: use filament_ramming_volumetric_speed(_nc) for ramming, falling back to
  max_vol_speed only when nil; gate precool temps on enable_pre_heating
- ToolOrderUtils: disable the inter-layer forecast in the per-nozzle base reorder so
  H2D/H2C ordering is unchanged
- PrintConfig: stop stripping filament_prime_volume in handle_legacy; document that
  prime_volume drives the Type2 wipe tower and filament_prime_volume the Type1 one
- GCodeProcessor: exclude post-print end-gcode M400 dwells from the M73 estimate and
  drop the dead air-filtration state
- Trim verbose BambuStudio source-location comments across the port

src/libslic3r/GCode/ToolOrderUtils.cpp

@@ -1098,8 +1098,10 @@ namespace Slic3r
             // This avoids expensive inter-layer transitions (e.g. ending layer with F2 when
             // next layer starts with F3, costing flush[F2→F3], instead of ending with F3
             // which gives flush[F3→F3]=0). Limited to ≤5 filaments due to O(N!×M!) complexity.
-            // Matches the multi-extruder path behavior (ToolOrderUtils.cpp:1227).
-            bool                      use_forcast = (filament_used.size() <= max_n_with_forcast && filament_used_next_layer.size() <= max_n_with_forcast);
+            // The per-nozzle base reorder does not use the inter-layer forecast. This function drives
+            // BBL multi-extruder grouping cost and H2C ordering, so keeping it false avoids perturbing
+            // existing H2D/H2C output.
+            bool                      use_forcast = false;
             float                     tmp_cost = 0;
             std::vector<unsigned int> sequence;
             uint128_t                 hash_key = filament_list_to_hash_key(filament_used, filament_used_next_layer, curr_filament_id, use_forcast);