Wiki not playing well with EE6

[nickpuglisi]

Hey guys, I'm still very much in love with EE Wiki, and a constant user for our internal team documentation. Running into some show stopping issues, and wanted to consolidate all the issues into one post for ya.

EE Version: 6.0.3
Wiki Version: 3.0.2
Wiki TOC Version: 3.0.0

1. Cannot edit Wiki in EE6

https://domain.com/admin.php?/cp/addons/settings/wiki/update&wiki_id=1

This now results in the following error, not allowing me to edit the wiki/category:

Unknown field MemberGroup.group_id
ee/ExpressionEngine/Service/Model/Query/Select.php:706

Stack Trace: Please include when reporting this error

2. Deprecated functions in Developer Log

I get hit with a dozen or so "Deprecated function" errors in the Dev Log when editing the wiki from front-end.

Deprecated function assign_parameters() called in
/var/www/path/system/user/addons/wiki/mod.wiki.php
on line 1657.

From template tag
exp:wiki:__construct

Deprecated function prep_url() called in
/var/www/path/system/user/addons/wiki/mod.wiki.php
on line 1374.

From template tag
exp:wiki:__construct
in wiki/index.

Deprecated since 4.2.0. Use ee('Format')->make('Text', $str)->url() instead.

Deprecated function assign_variables() called in
/var/www/path/system/user/addons/wiki/mod.wiki.php
on line 1345.

From template tag
exp:wiki:__construct
in wiki/index.

Deprecated since 4.0. Use ee('Variables/Parser')->extractVariables() instead.

3. Wiki TOC may be dead?

Installed the TOC add-on and now all my formatting seemed to die simultaneously and the [TOC] variable is not returning anything... very bizarre?

4. Markdown Support?

Last but not least, any chance we'll get Markdown support? Would love to use a modern framework for typing rather than bbcode ;)