Add docking of main viewport

- Change ImGui branch to docking
- Rework code to handle viewport resizes instead of window resize

CopiumEngine/src/copium/util/BoundingBox.cpp

@@ -20,6 +20,16 @@ namespace Copium
 
   glm::vec2 BoundingBox::GetSize() const 
   {
-    return rt - lb;
+    return glm::abs(rt - lb);
+  }
+
+  bool BoundingBox::operator==(const BoundingBox& boundingBox) const
+  {
+    return l == boundingBox.l && b == boundingBox.b && r == boundingBox.r && t == boundingBox.t;
+  }
+
+  bool BoundingBox::operator!=(const BoundingBox& boundingBox) const
+  {
+    return !(*this == boundingBox);
   }
 }

CopiumEngine/src/copium/util/BoundingBox.h

@@ -18,5 +18,8 @@ namespace Copium
     BoundingBox(glm::vec2 lb, glm::vec2 rt);
 
     glm::vec2 GetSize() const;
+
+    bool operator==(const BoundingBox& boundingBox) const;
+    bool operator!=(const BoundingBox& boundingBox) const;
   };
 }