Add support for lists and quote values in dict

This adds support for lists in the clang format options dictionary.
These are required for some settings such as 'ForEachMacros' and
'IncludeCategories'

Also quote values since they will otherwise break if they contain a colon (:)

Author: mhaehnel

autoload/clang_format.vim

@@ -3,6 +3,7 @@ set cpo&vim
 
 let s:on_windows = has('win32') || has('win64')
 let s:dict_t = type({})
+let s:list_t = type([])
 if exists('v:true')
     let s:bool_t = type(v:true)
 else
@@ -44,12 +45,12 @@ endfunction
 function! s:create_keyvals(key, val) abort
     if type(a:val) == s:dict_t
         return a:key . ': {' . s:stringize_options(a:val) . '}'
+    elseif type(a:val) == s:bool_t
+        return a:key . (a:val == v:true ? ': true' : ': false')
+    elseif type(a:val) == s:list_t
+        return a:key . ': [' . join(a:val,',') . ']'
     else
-        if type(a:val) == s:bool_t
-            return a:key . (a:val == v:true ? ': true' : ': false')
-        else
-            return a:key . ': ' . a:val
-        endif
+        return a:key . ': ''' . a:val . ''''
     endif
 endfunction