Main change:
Create function: normalize_syntax_settings(syntax)
Problem:
Some user prefer [[]] links more than []().
As vimwiki know both of them, they should be able to choose
without regex mastery and with tests
Solution:
let g:vimwiki_syntax_variables.markdown.Link1 = vimwiki#vars#get_global('WikiLinkTemplate1')
d9d14cc3f7