Patch - Improves code and UI for better engine stability - V14.5.30

Addresses minor issues across the engine to improve stability and UI.

- Updates ImGui window size for better rendering
- Adds macro for boolean returns (R_TRUE and R_FALSE)
- Adds missing includes and removes unused code
- Updates shader code to use the new macros and improve readability

enginecustom/imgui.ini

@@ -16,7 +16,7 @@ DockId=0x00000006,0
 
 [Window][render Stats]
 Pos=0,630
-Size=1265,231
+Size=1584,231
 Collapsed=0
 DockId=0x00000009,0