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/cpp/clangd.vim

@@ -6,6 +6,7 @@ call ale#Set('cpp_clangd_options', '')
 
 function! ale_linters#cpp#clangd#GetProjectRoot(buffer) abort
     let l:project_root = ale#path#FindNearestFile(a:buffer, 'compile_commands.json')
+
     return !empty(l:project_root) ? fnamemodify(l:project_root, ':h') : ''
 endfunction