Make Data Structure faster

[niccokunzmann]

The knittingpatternset is really inefficient. because lookups of positions are put to many locations.

• [ ] meshes should cache their positions
• [ ] instructions should cache their positions
• [ ] meshes first look up via their cache, then the instruction and then compute anew

Hints:

• This must be tested
• Test cache misses and cache usage and cache usage after a miss