Stabilize center of square, hex, weave patterns

[trevorld]

• square, hex, weave patterns are usually stabilized around the corners of the pattern but it may be more useful to stabilize around the center of the pattern instead

• "square" patterns:

  • [ ] diagonal
  • [ ] diagonal_skew
  • [x] horizontal
  • [x] vertical
  • [ ] square_tiling

• "hex" patterns:

  • [ ] hex1
  • [ ] hex2
  • [ ] hex3
  • [ ] hex_skew

• "weave" patterns