Animations for attachments

[supertuxkart-sourceforge-migration]

Author: hikerstk

Two fold:

1 Allow animated meshes, so bombs will show moving clock arm, parachutes will have air waves...

2 Make the link to kart be flexible as needed, bombs fixed to surface, but parachutes or anchors should show some delay, like if trully dragged by a chain or strings or some spring.

Migrated-From: https://sourceforge.net/apps/trac/supertuxkart/ticket/44

[supertuxkart-sourceforge-migration]

Author: hikerstk The first part is already done.

[supertuxkart-sourceforge-migration]

Author: auria Can you clarify what is missing? The bomb and parachute are already animated