X-Plane HIL proven both ways, data conversion and controls feedback set up correctly, needs actual HIL flights tests now

Pushed HIL with X-plane to being close to operational. Receiving from X-Plane  implemented, sending to it is prepared. Needs an iteration of onboard SW first

Removed a lot of verbose debug output, added connection indication to main menu bar to improve situational awareness of operator

Fixed a number of bad bugs in the HUD, will need a bit more write / SVG rewrite to make it pretty, but is substantially more accurate and reliable now

Addressed issue #26. Select System, Plugins and System are disabled when neccessary. Removed style-outdoor-dark.css. Moved the other two .css files and Vera.ttf into files/styles.