add particles.get_origin(...), particles.set_origin(...)

src/graphics/render/Emitter.cpp

@@ -113,3 +113,11 @@ void Emitter::stop() {
 bool Emitter::isDead() const {
     return count == 0;
 }
+
+const EmitterOrigin& Emitter::getOrigin() const {
+    return origin;
+}
+
+void Emitter::setOrigin(const EmitterOrigin& origin) {
+    this->origin = origin;
+}