Add support for versionswitch plugin

[macin]

We use vrsionswitch (https://www.dokuwiki.org/plugin:versionswitch) plugin for quick ability to switch between versions (dedicated namespace per version). It works similarly to translate plugin.
Before we switch to Mikio we'd love this to be supported.

[nomadjimbob]

Are you just using the ~~VERSIONSWITCH~~ syntax, or are you after something more specific in terms of support?

My testing shows that the ~~VERSIONSWITCH~~ works in the sidebar (it could be displayed a bit cleaner, but functionality is fine)

[macin]

So I was thinking this could be supported similarly to language translation in the toolbar. If you think this does not fit to the vision of Mikio template then let's keep it in the sidebar only, so this ticket can be closed :)

[nomadjimbob]

Something like the following?

[macin]

Oh yeah, this is brilliant!

[macin]

Here , for articles that do not exists in the listed version, the color should be grayed out, so it shows up as not available, now all types are of the same color.

Here is how it is supposed to work