ui: panning in code view

* Implemented horizontal panning for code snippets by dragging the mouse left and right.

src/lib/utility/utility.cpp

@@ -73,3 +73,8 @@ size_t utility::digits(size_t n)
 
 	return digits;
 }
+
+int utility::roundToInt(float n)
+{
+	return (n > 0.0f) ? (n + 0.5f) : (n - 0.5f);
+}

src/lib/utility/utility.h

@@ -39,6 +39,8 @@ namespace utility
 	bool intersectionPoint(Vec2f a1, Vec2f b1, Vec2f a2, Vec2f b2, Vec2f* i);
 
 	size_t digits(size_t n);
+
+	int roundToInt(float n);
 }
 
 template<typename T>