'Assets', some refactor

src/graphics/Batch2D.cpp

@@ -0,0 +1,18 @@
+#include "Batch2D.h"
+#include "Mesh.h"
+
+Batch2D::Batch2D(size_t capacity) : capacity(capacity),
+									offset(0),
+									color(1.0f, 1.0f, 1.0f, 1.0f){
+	const int attrs[] = {
+			2, 2, 4, 0 //null terminator
+	};
+
+	buffer = new float[capacity];
+	mesh = new Mesh(nullptr, 0, attrs);
+}
+
+Batch2D::~Batch2D(){
+	delete buffer;
+	delete mesh;
+}