More buildings

Added 2 more buildings. One is a resource generator that gives the
player a set amount of resources every time the player touches the
building (increases as time goes by). The other building is a WIP
attack tower that is supposed to shoot out projectiles at the enemy. I
was planning on making it very similar to how the WeaponScript works
for the player.
Bug fix and meta files

I didnt commit the meta files in the previous build so I had to re-link
some of the assets and scripts.
Merging Buildings with Master

Attack tower is still a work in progress.