HP bar added and some bug fixed

Since we are moving to ARPG gamemode, this game eventually has a HP system XDDDD 

Also I've sort of fix the floating window bugs by combine those small particles into larger parts. (I guess I won't spend a lot of time remake the current playground map, this bug will be fixed in the new game maps)

Also some poor troops are forced to join the game XDDDD They don't know what they are facing yet.