Fix multiple memory leaks and stale pooled allocations (#1)

Minecraft.Client/GuiParticles.cpp

@@ -7,6 +7,15 @@ GuiParticles::GuiParticles(Minecraft *mc)
 	this->mc = mc;
 }
 
+GuiParticles::~GuiParticles()
+{
+    for (GuiParticle *gp : particles)
+    {
+        delete gp;
+    }
+    particles.clear();
+}
+
 void GuiParticles::tick()
 {
     for (unsigned int i = 0; i < particles.size(); i++)
@@ -18,6 +27,7 @@ void GuiParticles::tick()
 
         if (gp->removed)
 		{
+            delete gp;
             particles.erase(particles.begin()+i);
 			i--;
         }