Amends the tool installation to use game install directory and correctly populate actions. Tools previously used an undocumented/unpopulated/inaccessible global install directory. This has been changed to use the game's install directory. Uninstall scripts are also now executed for tools when the game is uninstalled.
Fixes#414
Scripts are now grabbed from a separate request. This ensures that the contents of the scripts themselves don't muddy up the manifest model. This also opens up the potential to allow clients to redownload scripts without redownloading the entire game/tool/redist.
