Tuning
Added menu functionality and Bridge/tree triggers

Filled out menu functionality (objectives disappear as they're picked
up!), the bridge breaks when you walk past it, and the weird tree in the
back yard breaks when you click on it!  Almost there, need to finish up
the levels and fix up bugs!
Revert "Added menu functionality and Bridge/tree triggers"

This reverts commit b9eabdd0129b151faef9523d2b7016c4fff56571.
Revert "Revert "Added menu functionality and Bridge/tree triggers""

This reverts commit 6ca038bb46656aebee182061f18e40b4996e98fe.
Tuning...