New interface

[tofitouf]

I worked on the interface, enhancing the way object are selected and shown. Not much for the moment but mainly preparing the addition of bases and landing pad.
Zoom feature has been enhanced too. you can now have preselected zoom to see planet surface, atm or whole orbit.
Many correction of little bugs too. and new infos like altitude for vessels.

Thing still to do before next release : (personal todo list)
- auto-zoom with a optional period
- auto-hide menu
- show item and orbit when choosing "look at" like the info page
- Center on other points, Ap, Pe An Dn.... (Equal to center to object when setting time to Pet or Apt....., useless so)
- Show/Hide planet orbit if not needed
- Hide the orbit part behind the planet (DONE)
- Z Order changes

The release after this one should have :
- bases shown
- pad too
- target point and the direction to the target
- change current time to see future positions
- why not change the orbit at a time like transX.
- continue hyperbolic orbit by changing it's ref when outside the sphere of influence. to see the second part of the voyage.

bugs to correct :
- orientation of iss and mir (docks)
- rotation strange behavior (slerp error)