Revert "Vector Transform::scale -> scalar Transform::zoom"

This reverts commit b7fcfe10be2418eac97bb9f89b957d84ce359c56.
Revert "Added missing removeParent call in World::releaseEntity"

This reverts commit 7480a5e3f48d1feb0ab714d362404e4b0ac6a417.
Revert "Made Graphics children of Entities children of Camera"

This reverts commit 670380fcf260c996c01685c7b1f43dcf9d2a00a9.
Revert "Added parent to Transformable"

This reverts commit b68d7198cace149a6de683219baa499271779602.