Add EU7 PACK v11 UTEX, section unload, and LRU streaming caches

Bake deduplicated section texture lists (UTEX) and read them at runtime so
texture warm/prefetch no longer scans every instance. Evict PACK sections
outside a 16 km keep ring and cap mesh/nodedata/texture warm caches to stop
RAM and apply cost from growing without bound during long fast camera flight.

- Bake v11 (format=4): UMES + UTEX + CHNK; mesh/texture ordering by frequency
- Runtime: incremental UTEX warm, adaptive apply slices, preempt/catchup tuning
- Unload: track instances per section, Region erase, pack pool release
- LRU: mesh/nodedata (2000, ref-counted), warmed textures (2048)
- Bench/diagnostics: unload and cache eviction counters
- Fix pack instance erase in Region; resolve duplicate helper symbols

model/AnimModel.cpp

@@ -668,13 +668,18 @@ TAnimModel::LoadEu7PackWarm(
     if(
         false == texture_file.empty() &&
         texture_file != "none" &&
-        texture_file.substr( 0, 1 ) != "*" ) {
+        texture_file.substr( 0, 1 ) != "*" &&
+        false == texture_file.starts_with( "make:" ) &&
+        false == texture_file.starts_with( "@" ) &&
+        false == texture_file.starts_with( "none|" ) ) {
         auto normalized { texture_file };
         replace_slashes( normalized );
         if(
             normalized != "none" &&
             false == normalized.ends_with( "/none" ) &&
-            normalized.find( "tr/none" ) == std::string::npos ) {
+            false == normalized.ends_with( '/' ) &&
+            normalized.find( "tr/none" ) == std::string::npos &&
+            normalized.find( '#' ) == std::string::npos ) {
             m_materialdata.assign( normalized );
             if( m_materialdata.replacable_skins[ 1 ] == null_handle ) {
                 scene::eu7::pack_bench_inc( &scene::eu7::Eu7PackBench::main_texture_assign_fail );