implemented gothic 2 controls

[fhanrath]

Merge for #214

I noticed that the running attack seems to have a bug (even without this change).
In the gothic 1 control scheme the running attack sometimes doesn't work properly. Especially if you already did a normal attack.
In the gothic 2 control scheme the running attack always doesn't work properly.

When you try to initiate the running attack, the hero stops and does a normal attack which seems to hit twice.

I tried to find the issue in npc.cpp doAttack, but couldn't find anything related to the differentiation between a running and a normal attack.

Maybe it would be best to fix this problem in this branch, but I'm a bit lost right now.

The other attacks seem to work like vanilla gothic 2 with gothic 2 controls.

[fhanrath]

I added a commit to fix the running attack for the g2 controls.
Now the hero doesn't strike twice when doing a running attack. But sometimes he still stops when doing the attack.

In the g1 controls the hero always stops and hits twice now (on my branch and on master).

[Try]

@fhanrath thanks for PR, merged!