Improve ALE project style checking

* The project style linter now runs while you type.
* Now the scripts for checking the project require blank lines.
* Many style issues have been found and fixed.

ale_linters/json/jsonlint.vim

@@ -3,7 +3,6 @@
 function! ale_linters#json#jsonlint#Handle(buffer, lines) abort
     " Matches patterns like the following:
     " line 2, col 15, found: 'STRING' - expected: 'EOF', '}', ',', ']'.
-
     let l:pattern = '^line \(\d\+\), col \(\d*\), \(.\+\)$'
     let l:output = []