What do the changes you have made achieve?
This PR introduces new option for property-sort-order rule: display-mode: lines/blocks.
Display Mode"lines" (default) works as before. Display mode "blocks" tries to agregate wrongly sorted properties in longer blocks and displays one message per detected block instead of per single line. Message for block contains expected and actual order of properties in block.
There is naive algorithm used for block detection, may not support correctly some corner cases but in general should give better (or at least not worse) advices that original.

Are there any new warning messages?
Yes, introduces messages like:
"Expected order width, display, found display, width"
instead of
"Expected width, found display"
"Expected display, found width"
for detected blocks (single element blocks are reported as before).

Have you written tests?
Yes, single test in both scss and sass suites.

Have you included relevant documentation
Yes

Which issues does this resolve?
Closes #416

<DCO 1.1 Signed-off-by: Rafal Witczak [email protected]>