[Client] Added skill event

A event is not published in case a skill update is received from the server.
[Client] Added the introduce command
[Client] Added first basic version of the skill window
[Client] Improved skill handler layout
Merge branch 'master' of github.com:Illarion-eV/Illarion-Java
[Nifty-Controls] Fixed progressbar display problem
[Client] Fixed paperdolling update problem

The problem caused the wrong avatar instance to be updated
[Client] Improved paperdolling
[Client] Show final credits page
[Client] Reduced width of script inform display
[Client] Added walk-to

A single click on a tile causes the character to find a path towards this tile and walk along it
[Client] Open skill window with shortcut

shortcut C is now opening the skills window
[Nifty-Control] Removed old debug message
[Common] Added mesha to the credits
[Client] Turn in one place with mouse and CTRL
[Client] Added running with keyboard controls
[Client] Limit move-to to one mouse button
[Client] Improved appearance of script informs
[Client] Fixed position of the inform messages
[Client] Cleanup text before sending it to the server