changelog 009 - code cleanup

- general code clean up and bug fixes
- spontaneous clouds no longer "half spawn" when not above trees
- you can now spawn clouds with right click even if they aren't over trees
- minor tweaks with star particle generation
- reduced amount of rain particles spawned
- fixed z-order issues with speech bubbles and falling guppers
- replaced generic bare tree with specific ones for each tree type
- lowered rain height by a bit
- added balloons that spawn when a youngling is born
- added ability to spawn balloons with hotkey 
- changed star particle hotkey to "Q"
- adjusted rate at which house's food stores fill up

KNOWN BUGS

- babies don't fall off cliffs
- house's food stores can still fill up too quickly