Fix url regexp
Improve list item recongition.

Add `+` and `•` to bulleted list pattern. Recognize numbered listst, starting not with one.
Fix list item content regexp
Global refactoring. Add autocorrect button.
Localize strings (en, ru).
Trigger autocorrect on punctuation.
Do not wait Enter key to autoformat list items
Fix 1/2 in replacement table
Do not add `start=1` attribute to list.
Use list `start` property instead of attribute.