Minor - Améliore la gestion des entités ImGui - V14.8.0

Optimizes entity list updates in the ImGui interface by caching entity names and IDs.

This reduces unnecessary string operations during rendering and improves performance, especially when dealing with a large number of entities.

The initial ImGui window size has also been reduced for performance reasons.

enginecustom/imgui.ini

@@ -1,6 +1,6 @@
 [Window][DockSpace]
 Pos=0,0
-Size=1536,793
+Size=32,32
 Collapsed=0
 
 [Window][Debug##Default]
@@ -22,15 +22,15 @@ DockId=0x00000009,0
 
 [Window][Objects]
 Pos=0,19
-Size=251,774
+Size=15,22
 Collapsed=0
-DockId=0x0000000B,1
+DockId=0x0000000B,0
 
 [Window][Terrain]
 Pos=0,19
-Size=251,774
+Size=15,22
 Collapsed=0
-DockId=0x0000000B,0
+DockId=0x0000000B,1
 
 [Window][Log Window]
 Pos=0,630
@@ -57,7 +57,7 @@ Collapsed=0
 DockId=0x00000002,0
 
 [Docking][Data]
-DockSpace         ID=0xCCBD8CF7 Window=0x3DA2F1DE Pos=0,19 Size=1536,774 Split=X
+DockSpace         ID=0xCCBD8CF7 Window=0x3DA2F1DE Pos=0,19 Size=32,22 Split=X
   DockNode        ID=0x00000001 Parent=0xCCBD8CF7 SizeRef=1350,842 Split=X
     DockNode      ID=0x00000005 Parent=0x00000001 SizeRef=1265,842 Split=Y
       DockNode    ID=0x00000003 Parent=0x00000005 SizeRef=1584,609 Split=X