core: Move to hyprutils for Math

Moves CRegion, CBox and Vector2D over to hyprutils.

Requires hyprutils>=0.1.4

src/render/decorations/CHyprGroupBarDecoration.hpp

@@ -48,7 +48,7 @@ class CHyprGroupBarDecoration : public IHyprWindowDecoration {
     virtual std::string                getDisplayName();
 
   private:
-    SWindowDecorationExtents m_seExtents;
+    SBoxExtents              m_seExtents;
 
     CBox                     m_bAssignedBox = {0};