- New config parameter options.legend.align, for controlling alignment of legend blocks in horizontal/vertical legends.
- Maintains backward compatibility for legends positioned on the left/right by defaulting to 'start'.
- Replacing nearby pixel unit tests for legend with image based tests
- Documentation for options.legend.align

- whitespace as tabs only to align with project lint standards
- replacing 'this' references with a local 'me' variable
- removal of label text to avoid cross-platform font issues in image tests
- added an image test for default alignment of 'start' for vertical legends (left/right)

- adding colour and removing borders from image tests for legend blocks.
- corrected/adjusted all images in image tests
- changed default align for vertical positioned legends to 'center'
- refactored alignment offset function
- removed superfluous 'line' variable
- made consistent the check for moving to a new line/column between vertical/horizontal fit algorithm

…egends

…onsistent and slightly more readable