configure expression for Todo words (#1053)

Enable the user to conveniently set the regular expression used for the
`VimwikiTodo` syntax group, instead of the defaults which might be
more suitable to code.

This setting is now also local per wiki.

Signed-off-by: Amit Beka <--->

Co-authored-by: Amit Beka <--->

autoload/vimwiki/html.vim

@@ -645,7 +645,7 @@ function! s:process_tags_typefaces(line, header_ids) abort
   " Convert line tag by tag
   let line = s:make_tag(line, s:rxItalic, 's:tag_em')
   let line = s:make_tag(line, s:rxBold, 's:tag_strong', a:header_ids)
-  let line = s:make_tag(line, vimwiki#vars#get_global('rxTodo'), 's:tag_todo')
+  let line = s:make_tag(line, vimwiki#vars#get_wikilocal('rx_todo'), 's:tag_todo')
   let line = s:make_tag(line, s:rxDelText, 's:tag_strike')
   let line = s:make_tag(line, s:rxSuperScript, 's:tag_super')
   let line = s:make_tag(line, s:rxSubScript, 's:tag_sub')

autoload/vimwiki/vars.vim

@@ -295,8 +295,6 @@ function! s:internal_global_settings() abort
   let g:vimwiki_global_vars.rxWikiInclSuffix1 = g:vimwiki_global_vars.rxWikiInclArgs.
         \ g:vimwiki_global_vars.rxWikiInclSuffix
 
-  let g:vimwiki_global_vars.rxTodo = '\C\<\%(TODO\|DONE\|STARTED\|FIXME\|FIXED\|XXX\)\>'
-
   " default colors when headers of different levels are highlighted differently
   " not making it yet another option; needed by ColorScheme autocommand
   let g:vimwiki_global_vars.hcolor_guifg_light = ['#aa5858', '#507030', '#1030a0', '#103040'
@@ -532,6 +530,7 @@ function! s:get_default_wikilocal() abort
         \ 'toc_header': {'type': type(''), 'default': 'Contents', 'min_length': 1},
         \ 'toc_header_level': {'type': type(0), 'default': 1, 'min': 1, 'max': 6},
         \ 'toc_link_format': {'type': type(0), 'default': 0, 'min': 0, 'max': 1},
+        \ 'rx_todo': {'type': type(''), 'default': '\C\<\%(TODO\|DONE\|STARTED\|FIXME\|FIXED\|XXX\)\>'},
         \ }
 endfunction