set dx-management 1 as default

add dx-use-dynamic-textures config option

panda/src/dxgsg9/config_dxgsg9.cxx

@@ -132,7 +132,7 @@ ConfigVariableBool link_tristrips
 // true = use DirectX management of video memory
 // false = see dx_lru_management config variable below
 ConfigVariableBool dx_management
-("dx-management", false);
+("dx-management", true);
 
 // valid only if dx_management == false
 // true = enable LRU management of video memory
@@ -175,6 +175,9 @@ ConfigVariableBool dx_lru_debug
 ConfigVariableInt dx_lru_debug_frames_til_output
 ("dx-lru-debug-frames-til-output", 500);
 
+ConfigVariableBool dx_use_dynamic_textures
+("dx-use-dynamic-textures", true);
+
 ConfigureFn(config_dxgsg9) {
   init_libdxgsg9();
 }