Smoother gfx, performance improvements..

Mainloop is now running at 1 millisecond to allow smoother rendering of
gfx - also the gfx drawing performance has been improved.

Selection routines now behave much quicker due to code optimizations
like laying out variables.

Discovered planets in log view are now sorted by distance.

Planets are now only displayed using graphics; interesting idea might be
to fall back to "simple colored circles" if gfx are not found/loaded.

Other players planets are now shown by there name if discovered.

Bind and unbind handlers are now not anymore called during mainloop
processing, which slightly decreases mainloop times.

Scrolling to a location is now "smoothed", meaning that the further the
planet/fleet is, the speed is adopted. But this might not work as is on
very long distances. At the moment only depends on x axes distance, not
total distance.

Also, from now, only log links are shown for the current player, not
from the second player. (Strg+Tab to change player)

Scanareas are brigther now.