General cleanup; fixed full screen; added drone

HD Mode is really "Full Screen" mode; we are not changing resolution. We
have some redundant variables, like HDEnabled, which is already tracked
via standard XNA components. I added a circling drone in Fighter Carrier
class, but had to override DrawNonAuto - GLib does not allow for Origin
setting - will fork GLib Repo and add Pull request (unless Glen reads
this commit message and adds a setter first :) ).