Clean up pattern operators

[t3kt]

• [ ] hexagonalTruchetPattern uses hard-coded colors for one of the formats
• [ ] hexagonalWeavePattern's variables are confusing and possibly incorrect
• [ ] hexagonalWeavePattern uses hard-coded black for the edges
• [ ] hexagonalWeavePattern needs more input fields
• [ ] brickPattern is inverted from what gridPattern and hexagonalGridPattern do
• [ ] knitPattern needs input fields, and more customization options
• [ ] rosettePattern, the spread parameter is negated
• [ ] spiralPattern needs thickness and blending params, and input fields