* Allow the bullet point characters of lists to be configures by the wiki option `bullet_types`. This allows to use other/additional characters for the bullets of lists – including unicode-chars like '→' or '•'. The default values depends on the chooses syntax.
* Allow to configure `vimwiki-listsyms` and `vimwiki-listsym_rejected` on per wiki basis.
* Fix a test for mediawiki syntax
ac4d0a1d46
