1)Submodule Engine updated.

2) ball (WIP)

Submodule Engine:
    > 0252b05 - 1) renamed functions
    > ffd2101 - 1) reading mass from xml
    > b00d26c - 1) restructuring the how the physics works (WIP)
    > 2f6a6b2 - fix for hashed string assignement operator