Fix recycling in sprinkles

[nutterb]

• When recycle = none, the sprinkle should be of length 1.
• When recycle = cols or recycle = rows, the sprinkle may be greater than length 1

affected sprinkles

• [x] sprinkle_align
• [x] sprinkle_bg
• [x] sprinkle_border
• [x] sprinkle_font
• [x] sprinkle_height
• [x] sprinkle_na_string
• [x] sprinkle_pad
• [x] sprinkle_rotate_degree
• [x] sprinkle_round
• [x] sprinkle_width

1. Reverse order of index_to_sprinkle and sprinkle_*_index_assert
2. add recycle <- recycle[1] after index_to_sprinkle
3. Adjust error checks in sprinkle_*_index_assert
4. Add requirements
5. Add tests