Config for tuning fuzzy match

[l4l]

submlime-fuzzy introduced in #125 allows to fine-tune matching parameters which is kinda nice.

• Add matching section to config;
• Add there options for Scoring (use default values if some are not specified);
• Add flag for case sensitivity;
• Propagate this config to FilteredLines and replace best_match call with sublime_fuzzy::FuzzySearch::new(..).score_with(..);
• Don't forget to update the Configuration wiki after merging.