Make launching bzr easier.

[boardwalk]

bzr_launch_hook currently needs to be placed in AC's directory after the AC launcher is logged in. We may be able to add a version resource to the exe to prevent this.

Ultimately, especially for platforms other than Windows, reverse engineering the launcher so it is no longer necessary would be very nice. Unfortunately, the variant of Asheron's Call's protocol used by the launcher is mostly an unknown.