Added control surfaces features based on names to F15.

They make the difference, but I'm not sure they are correctly implemented.
Added F15's control surface parameters and forces to property window.
Added debug control surface drawing to F15::drawtra().
Visualized control surfaces movements as tilting of debug shapes.

We don't have aileron nor elevator models in F15.mqo nor motion
definitions so we cannot show their intended position.
But we can see the problem of the current settings and tweaked
them with this visualization.
Now it looks much better and somewhat playable as a simple
flight simulator.
Made control surface sensitivities be configurable from script.

The sensitivity magnitude and sign are specified in per-wing basis,
so we no longer need two elements to store aileron value.
We'd revisit this if we need to implement flaperon.
Tweaked aerodynamic tensors for F15 a bit.
Made Aerial (and F15) be selectable with mouse click.

Also made F15 load hitRadius from initialization script, instead
of hard-coded value.
Revived F15 HUD display codes showing throttle and steering status.
Made thrust strength of F15 configurable from script.

The initial value is reduced to make the response more realistic.
Adjusted orders of static values for F15.
Added ability to shoot the gun to F15.

Also made the gun position (where bullets are shot from) configurable
from Squirrel script.
Made cockpitView camera positions configurable from script.
Added Vec2 class to cpplib.