Fixed the crash caused by improper deletion of VBOs in ParticleSystemQuad.
closed #2480: Fixed the crash caused by improper deletion of VBOs and VAO in ParticleSystemQuad.
Merge pull request #3369 from dumganhar/iss2480-vao-vbo-crash

closed 2480: Fixed the crash caused by improper deletion of VBOs and VAO in ParticleSystemQuad.